Problem with customer login

Hello everyone, I hope you can help me!

I’ve just finished the web page I’m working on and I’ve been testing everything to check if all works.

The problem I’m having is that a user already registered cant login to his account. For example I create an account during purchase (I log out as admin, clear cache and simulate a purchase and also a normal registration), and when everything is paid I can see I’m still logged in as the buyer, but if I log out an go to the My account page and try to log back in I get this error all the time:

Please try to submit the form again.

I also get this error if I go directly to the my account page and register, which I can do with no problems and even receive the confirmation email with the username, but when I try to log in I get the same error:

Please try to submit the form again.

Could you please help me?

Thank you everyone ??

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