Yea, I get those a lot. Sometimes people may hit the zap button by accident, or they back out to change the amount, etc. They eventually expire and it’s no big deal.
Discussion
It actually happens on my Damus.
If I press the zap on a note it looks like it’s zapped but actually doesn’t go through.
So now I have to go to the profile in order to zap it, I cannot zap notes.