Maybe just the glitchy code here. Sometimes when you edit text you've saved the edit doesn't stick either. Actually most times. I also observed something similar with votes not sticking on reddit in the past, like when you back out of a post and refresh the front page, your up or down vote on the post would be wiped. Might be a cookie issue or something.
This is part of a recent change to combat vote manipulation, it's not a permanent solution. It was mentioned on the changelogs: https://communities.win/p/12iNisblbB/minor-changes-to-voting/
Discarding votes is a big deal - we never want to do it, but as a short term solution, it was necessary.
test
Maybe just the glitchy code here. Sometimes when you edit text you've saved the edit doesn't stick either. Actually most times. I also observed something similar with votes not sticking on reddit in the past, like when you back out of a post and refresh the front page, your up or down vote on the post would be wiped. Might be a cookie issue or something.