I think there's a bug in Pronamic_Google_Maps_Mashup, although it hasn't actually broken anything on my website.
WordPress Codex says that:
If you use the_post() with your query, you need to run wp_reset_postdata() afterwards to have Template Tags use the main query's current post again.
But Pronamic_Google_Maps_Mashup does not call wp_reset_postdata(). I think this should be inserted after line 86?