Hi @ebonweaver,
We are sorry for the inconvenience caused. The issue seems to be really strange! Since there is no such issue in our test environment, none of the users have reported this issue before.
It seems that there is a conflict between the plugins on your site. Please deactivate all other plugins except User Registration and see if it works or not. If everything works fine, you can activate other plugins simultaneously and do test registrations. This will let you know the cause of the error.
At the same time, We request you allow us to help you before jumping in to provide a one-star rating. If we are unable to help you out and ignore your support request, then your one-star rating would have been justified.
We checked the issues that you have pointed out, and everything seems to be working fine in our test environment. So could you please contact us via this link: https://wpeverest.com/contact/ so that we can help you fix your issues.
We hope you can review the rating once your issue has been resolved.
Have a nice day!.
Thanks and Regards!