All you have to do.
1. You must replace the crome you are using, with the new Chrome.
Example.
-Chrome Beta, Chrome Canary or Chrome Dev.
You must turn off the computer or smartphone that you are using for a few minutes, and then restart it.
and don't forget to clean the virus.The problem that you experience like this, right.
When empty submit, appears.
When you write submit it disappears.
Good luck.