Random font problem

Hello, I’m having a random font problem. I’m in the process of importing entries from my old host, and everything had been working fine and dandy until now. All of a sudden, my sidebar text is huge!! Also, some of the latest entries are in a bigger font than they’re supposed to be. The weird thing is, if you click on ‘previous entries,’ the fonts return to normal. So then I started deleting posts, thinking that one of the imported entries was messing something up. No such luck, as anything that moves up onto my front page gets big!

The only thing I can think of that might have happened was at one point I was using the HTML editor to fix something—I copy and pasted some code over from Dreamweaver and hit ‘submit.’ Well, it turned out to be an HTML editor window still open from a previous post, so nothing seemed to happen and I opened the proper HTML window and went about my business. But maybe using the wrong window messed something up?

Anyway, I’d greatly appreciate any help anyone can offer. My site is mydogischelsea.com.

Thanks!!!
Laura