Hi @itskaehler
From your description it strongly seems that one or the other plugins in the site (or may be the theme) is conflicting.
As advised earlier, we recommend that you check whether the issue persists when you change to a default WP theme like Twenty Twenty-One or Storefront, and deactivate all plugins apart from WooCommerce. If this issue does not persist at this point, you’ll want to reactivate your theme/plugins one by one until you find the one causing the issue. Here’s the conflict test guide for reference: https://docs.woocommerce.com/document/how-to-test-for-conflicts/
If nothing comes out of the conflict test, could you please share a copy of your site’s System Status? You can find it via WooCommerce > Status. Select “Get system report” and then “Copy for support”. Once you’ve done that, paste it here in your response.