I've installed both the Jetpack plugin and Yarpp (both with the latest versions).
Everything works perfect until I activate the Likes module of Jetpack. Then the text "Related Posts" overlaps the text "Be the first to like this" from the Likes module as you can see in this picture
I don't know if it matters, but I'm using the default WP theme Twenty Fourteen. I've tested the result with only Jetpack and Yarpp activated as plugins but the results are the same as when I have the other plugins installed (Fourteen Extended and others).
I've also tested it with the Jetpack module Share this deactivated, but the result is the same. So it is somehow related specifically to Likes.
Right now I have the Likes module deactivated, hence the link to the screenshot instead of a link to an example post.