Just an update, I found out that it is the whole bottom right of the screen does not work.

The check button on my vivoactive is broken, so when I go to delete a run I can only push the X not the check mark. And when I wore it in the shower it went into sleep mode and I could not get it out for the same reason. I got it out of sleep mode by holding both buttons until it turned off but I still can't push any check marks. Another thing, there is a tiny crack in the top right of the screen so that might be the cause.