I'm used to the default font in posts being something like an Arial or sans-serif, around a size 2. Until recently, when I've inserted one of my "asides" I've specified size 1 and that text has come out significantly smaller.

Lately, though, the basic text in all posts, old or new, looks the way size 1 used to look, and when I specify "size 1" the text gets bigger, not smaller.

I'm guessing that this may be the result of a change to the stylesheets or something.

Is this a glitch, or was it done for a reason -- or could it be only happening to me? I did recently get a new monitor but I wouldn't have expected any of the ensuing system changes to affect the text size in posts this way.

Samples:
specifying size 1 and back to default
specifying size 2 and back to default
specifying size 3 and back to default
I didn't think there was any such thing as -->size 0<-- but even THAT seems to come out bigger than the default.