Google Analytics for WordPress screws up formatting of my site

I just installed the Google Analytics for WordPress plugin. All I did was enter my GA account ID – I didn’t use any of the plugin configuration options.

When I went back to look at my blog, I saw that there were several formatting errors on the front page. You can see what I mean here:

and here:

See the different sizes of text in the first example, and the extremely small text in the box in the second example (it’s not supposed to be that small).

I know the plugin is causing the problem (or conflicting with another plugin), because when I disable it the problems disappear.