Default Samsung Keyboard double letters

I'm facing the following problem when I'm typing an URL address in Chrome address bar. The 1st letter is doubled!!! Sometimes, when I delete the second letter and I type another one, both letters are doubled!!!! for example:
I type "i" it becomes "ii"
I delete second "i" and type "n" it becomes "inin"

it's very frustrating and I wouldn't like to go to Google's keyboard nor turn of predictive text or something.
On on 4.4.2 FNB8

Any solution?

thanks