Font sizes...what the heck

Does anybody else have a issue with some of their replies or posts being really small sometimes and really big other times? I'm using a phone instead of a computer computer I wonder if that has any thing to do with it. I can't change the size or anything of my font

Hmm, I have had my font size change when I am writing to certain ladies!!

Noproblems here!

I just want an actual sarcastic font, but noo.. they can't do that