Yikes! Why is half the text in my post huge?

I can't show you the post, because I made it with another profile, and we're not allowed to have two profiles post to a single group.

I just made a post with two paragraphs. The first and third paragraphs have huge type!

I didn't format anything in the post except to tag a community, and that's only in one paragraph. The other large paragraph doesn't have any tags or formatting.