I've this really strange issue with form js validation error.
I've never edited anything related to it and there are no js errors in the console.
The problem is that an error like "This is a required field" appear for 1 - 2 seconds and then disappear.
Looking the console I can see that the opacity of the div .validation-advice goes from 0 to 1 and the again from 1 to 0 without stopping.
And also the display property remains "none".
This happens in every situation where js validation is required.
This is a screenshot of login page
I'm going crazy I really don't know where to check.