Right misses are commonly caused by plucking, forcefully opening the fingers rather than relaxing them, and creeping. That's a much shorter list than the one for left misses. How do I know? I've done them all.
Plucking is pretty obvious, at least to me, and usually results in a high miss to the right. The telltale is that your string hand ends up waving to the crowd.
Trying to open the fingers rather than letting them relax usually results in a straight right miss, but not always. This is not obvious, and you may not be aware that you're doing it.
Creeping could result in a low right miss. When I creep, I creep with my string arm. Anyone who watches you from the side should be able to see if you're creeping.