Did the font sizes or page scaling change just a little while ago?
Suddenly the text was bigger, so I adjusted my browser to smaller default font, but now other sites are smaller than they were before. :(
I thought there was a short glitch but I had so many windows open and then it self-cured.
SOmetimes random things like that can happen when your browser will load CSS funky or something similar. Nothing that can really be done about it, just refresh and everything will be better. If it's not, then there's something wrong that needs to be looked at.