Big gap under map?

I don’t know how long ago this started, as we are using caching and I just cleared it. But when I did, a big gap appeared under the map before the following contents. I tried disabling the plugin and the gap disappears (so does the map of course, but the map URL code that shows has no gap under it)
I tried changing the plugin’s height setting but it didn’t do any good, even though (as I said) I cleared the cache.

Any idea where this is coming from? It’s not something we added to custom CSS, yet it’s attached to ose-google-maps in element.style – where you can’t alter it.

The page I need help with: [log in to see the link]