Cart shows free shipping in between normal shipping costs

The link is for one product, but the problem occurs with all products.

When adding one or two items to the shopping cart, the proper shipping costs are shown. Adding 3, 4 or 5 items and it says shipping is free. From 6 and above again the proper shipping costs are shown.

I don’t see anything wrong with the shipping settings or classes. And the only other Woocommerce related plugin I use is https://nl.wordpress.org/plugins/woo-discount-rules/

But even when deactivating all plugins except Woocommerce and the WooCommerce Legacy REST API plugin, the problem remains.

I’m using GeneratePress.

System Status Report

### WordPress Environment ###

WordPress address (URL): [Redacted]
Site address (URL): [Redacted]
WC Version: 9.6.0
Legacy REST API Package Version: ✔ 1.0.5
Action Scheduler Version: ✔ 3.9.0
Log Directory Writable: ✔
WP Version: 6.7.1
WP Multisite: –
WP Memory Limit: 512 MB
WP Debug Mode: –
WP Cron: ✔
Language: nl_NL
External object cache: ✔

### Server Environment ###

Server Info: Apache
PHP Version: 8.2.27
PHP Post Max Size: 8 MB
PHP Time Limit: 600
PHP Max Input Vars: 1000
cURL Version: 7.61.1
OpenSSL/1.1.1k

SUHOSIN Installed: –
MySQL Version: 10.6.15-MariaDB-cll-lve
Max Upload Size: 2 MB
Default Timezone is UTC: ✔
fsockopen/cURL: ✔
SoapClient: ✔
DOMDocument: ✔
GZip: ✔
Multibyte String: ✔
Remote Post: ✔
Remote Get: ✔

### Database ###

[REDACTED]

### Post Type Counts ###

attachment: 453
client: 6
custom_css: 2
frm_form_actions: 5
frm_styles: 1
gp_elements: 7
ml-slide: 2
ml-slider: 2
nav_menu_item: 11
note: 1
oembed_cache: 9
page: 34
post: 13
product: 141
product_variation: 541
pronamic_gateway: 1
pronamic_payment: 128
seedprod: 1
shipping_rules: 1
shop_coupon: 30
shop_order: 115
slide: 1
tablepress_table: 6
wp_block: 4
wp_global_styles: 3
wp_navigation: 3
wp_template: 2

### Security ###

Secure connection (HTTPS): ✔
Hide errors from visitors: ✔

### Active Plugins (20) ###

Code Snippets: door Code Snippets Pro – 3.6.7
Yoast Duplicate Post: door Enrico Battocchi & Team Yoast – 4.5
GTM4WP - A Google Tag Manager (GTM) plugin for WordPress: door Thomas Geiger – 1.20.3
Formidable Forms: door Strategy11 Form Builder Team – 6.17.1
GDPR Cookie Compliance: door Moove Agency – 4.15.8
GenerateBlocks: door Tom Usborne – 1.9.1
GP Premium: door Tom Usborne – 2.5.0
Kadence Blocks – Gutenberg Blocks for Page Builder Features: door Kadence WP – 3.4.8
Post Types Order: door Nsp Code – 2.3.3
Pronamic Pay: door Pronamic – 9.13.0
PW WooCommerce Bulk Edit Pro: door Pimwick
LLC – 3.9

Redirection: door John Godley – 5.5.1
UpdraftPlus - Backup/Restore: door TeamUpdraft
DavidAnderson – 2.25.1.26

W3 Total Cache: door BoldGrid – 2.8.4
Out Of Stock Message Manage for WooCommere: door coderstime – 2.7
Discount Rules Core: door Flycart – 2.6.6
WooCommerce Legacy REST API: door WooCommerce – 1.0.5
WooCommerce: door Automattic – 9.6.0
Wordfence Security: door Wordfence – 8.0.3
Yoast SEO: door Team Yoast – 24.3

### Inactive Plugins (1) ###

Meta pixel for WordPress: door Facebook – 4.0.1

### Dropin Plugins () ###

advanced-cache.php: advanced-cache.php
db.php: db.php
maintenance.php: maintenance.php
object-cache.php: object-cache.php

### Settings ###

Legacy API Enabled: ✔
Force SSL: –
Currency: EUR (€)
Currency Position: left_space
Thousand Separator: .
Decimal Separator: ,
Number of Decimals: 2
Taxonomies: Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

Taxonomies: Product Visibility: exclude-from-catalog (exclude-from-catalog)
exclude-from-search (exclude-from-search)
featured (featured)
outofstock (outofstock)
rated-1 (rated-1)
rated-2 (rated-2)
rated-3 (rated-3)
rated-4 (rated-4)
rated-5 (rated-5)

Connected to WooCommerce.com: –
Enforce Approved Product Download Directories: –
HPOS feature enabled: –
Order datastore: WC_Order_Data_Store_CPT
HPOS data sync enabled: –

### Logging ###

Enabled: ✔
Handler: Automattic\WooCommerce\Internal\Admin\Logging\LogHandlerFileV2
Retention period: 30 dagen
Level threshold: –
Log directory size: 1 KB

### WC Pages ###

Winkelbasis: #2859 - /winkel/
Winkelwagen: #2860 - /winkelwagen/ -  Bevat de [woocommerce_cart] shortcode
Afrekenen: #2861 - /afrekenen-2/ -  Bevat de [woocommerce_checkout] shortcode
Mijn account: #2862 - /mijn-account-2/
Algemene voorwaarden: ❌ Pagina niet ingesteld

### Theme ###

Name: GeneratePress Child
Version: 0.1
Author URL: https://tomusborne.com
Child Theme: ✔
Parent Theme Name: GeneratePress
Parent Theme Version: 3.5.1
Parent Theme Author URL: https://tomusborne.com
Theme type: Klassiek thema
WooCommerce Support: ✔

### Templates ###

Overrides: –

### Pimwick Plugins ###

PW WooCommerce Bulk Edit Pro: License key: PW-63b46d989b6a3
Result: success
Cached: 2025-02-04


### Admin ###

Enabled Features: activity-panels
analytics
product-block-editor
coupons
core-profiler
customize-store
customer-effort-score-tracks
import-products-task
experimental-fashion-sample-products
shipping-smart-defaults
shipping-setting-tour
homescreen
marketing
mobile-app-banner
onboarding
onboarding-tasks
pattern-toolkit-full-composability
product-custom-fields
remote-inbox-notifications
remote-free-extensions
payment-gateway-suggestions
printful
shipping-label-banner
subscriptions
store-alerts
transient-notices
woo-mobile-welcome
wc-pay-promotion
wc-pay-welcome-page
launch-your-store

Disabled Features: product-data-views
experimental-blocks
coming-soon-newsletter-template
minified-js
product-pre-publish-modal
settings
async-product-editor-category-field
product-editor-template-system
blueprint
reactify-classic-payments-settings
use-wp-horizon
add-to-cart-with-options-stepper-layout
blockified-add-to-cart

Daily Cron: ✔ Next scheduled: 2025-02-04 12:44:43 +01:00
Options: ✔
Notes: 220
Onboarding: completed

### Action Scheduler ###

Voltooid: 2.988
Oldest: 2025-01-04 09:55:22 +0100
Newest: 2025-02-04 09:51:38 +0100

Mislukt: 75
Oldest: 2022-10-14 17:20:03 +0200
Newest: 2024-12-20 08:02:18 +0100

In afwachting: 7
Oldest: 2025-02-04 10:00:00 +0100
Newest: 2025-02-05 01:00:00 +0100


### Status report information ###

Generated at: 2025-02-04 09:52:14 +01:00

The page I need help with: [log in to see the link]