Extra chars being added sometimes on keypress

[inoda]

Steps to reproduce:

1. Create a SSN mask
2. Click right before the first "-"
3. Type "232"
4. See that what you actually get is ___-23-222_

Another scenario (using SSN mask)

1. Click to start typing at the 2nd char
2. Type "23"
3. Click right before the "2"
4. Type "1"
5. See that what you actually get is _23-12-3___