I though on my S4 if I long pressed the "n" I would get the "," on the S5 I have to long press the "n" and then press the "," If I long press the "m" I get the "?" any way to fix it???
There's a comma key immediately to the left of the space key, you don't even have to long press. Nothing is broken that needs "fixing." It's just a different keyboard layout (I assume, I've never used an S4).