Strange. I don't want you to think you're being ignored, but unless someone has had the same problem (and I almost never use my phone to fill out forms), someone would have to have your phone in his hand to see what the problem is.
(Try restarting into Safe Mode. If that fixes it, it's one of the apps you've installed. Then the problem becomes remembering which one you installed just before the problem started. Or back them all up with
App Backup & Restore, uninstall them all [you'll lose the data, though, unless you root the phone and pay for
Titanium Backup ], then restore them one by one, checking Chrome each time, until you find the one that causes it.)