Backspace on Signs

When you press Backspace in a Sign window, it doesn't delete one charater , it deletes as many as it can find for some reason, and sometimes 2-3.

What happens:
Deletes more than one character

Recreate the issue
On the Xbox One:

1. Create and place a sign
2. Type some text (and deliberately make a mistake) and try to delete a character in KEYBOARD MODE , it should delete more than one character.

Expected result:
The keyboard deletes one character per key press of the Backspace button.

What actually happens.
It deletes a random number of characters.

Screenshots Attached: No