Sign up form disappears when I highlight password

windows

#1

When I was signing up to post on here, I had the sign up form filled out but my password was too short. Every time I highlighted the password with my mouse to change it the form would disappear. If I clicked sign up again the form would reappear with all the info still filled out. This continued to happen until I clicked to the right of password I had entered and hit backspace to clear.