Hi @supaiku,
When a user is logging in on the checkout page during their order and they enter the wrong password, do error is show, the page simply reloads. Where is the setting to make sure an error is shown when the wrong credentials are entered on the checkout page login form?
I’ve performed some cross-testing for us today on several of my sites which have the latest versions of WordPress, WooCommerce and our free Storefront theme as the only enabled software. When doing so I’ve not been able to replicate the behaviour which you describe.
By default, the free WooCommerce plugin shows this message on the checkout page for an incorrect password. There is also no setting in the WooCommerce plugin to enable or disable this particular message.
https://woostaging.mystagingwebsite.com/checkout/

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From what you have described, it could be code from another plugin or theme which has caused a possible conflict and affected the functionality of WooCommerce and is removing this default incorrect login details message.
To see if that is the case we’d suggest carrying out a conflict test on your site by disabling all other plugins aside from WooCommerce along with switching to a theme like Storefront. This will help with trying to and locate what software you have installed which could possibly be causing this behaviour? You could use a free plugin called Health Check and Troubleshooting to carry out such testing.
When in Troubleshooting mode all plugins will be deactivated and only the admin of the site carrying out the troubleshooting would see those changes. Any customers visiting the site would see no changes at all.
Once you have disabled all other plugins and switched theme if the behaviour is resolved you can then enabled your theme and sites plugins testing after each one is enabled until the behaviour returns to locate the culprit.
https://docs.woocommerce.com/document/how-to-test-for-conflicts/
I hope this helps.
We’ve not heard back from you in a while, so I’m marking this thread as resolved.
Hopefully, you were able to find a solution to your problem! If you have further questions, please feel free to open a new topic.
Cheers! 🙂