not compatible with woocommerce guest purchases?

I activated only the ‘Registration Form’ protection and use an invisible captcha. If a (woocommerce) customer use the guest purchase and don’t fill out into a required form field then usually he gets a hint to complete the required form fields. This hint is visible for one second and then the site is refreshing.
The same behavior happen while usual registering and empty password field.

In the case you have to solve the captcha, the captcha disappears after the automatic refresh of the page.

If I deactivate this plug-in, everything works well, all hints are visible and the site doasen’t refresh.