On my Samsung Note 4, backspace issue

[TardyKestrel1]

Usually when I put a period down and try to backspace it will backspace the period (like it should) but then the letter before it too! It's highly annoying and it just started, how can i fix this? I tried clearing the stored data on my keyboard already.

 

[B. Diddy]

Welcome to Android Central! Did you manually type that period, or was it automatically placed there because of a double spacebar tap?