The registration form has stopped registering. What is the reason?

Question

Drupal

After pressing the register button, I get the left page, it sends me to the address:
http://MYSITE/form_action_p_pvdeGsVG5zNF_XLGPTvYS...
Everything worked before. I just set the property required = false to some fields, added a check in the validation function, but it doesn’t get to it ...
For what reason can forms stop performing the validation and submit functions, and send to xs which page by action?

Answer 1

Check what is displayed on the front, what is the action attribute of your form. It is clear that something is wrong with him. See if everything is ok if you remove your changes, etc.