I have edited questions a couple of times, and will get rejected by Community (user -1) and will look at the question and it will contain the edits that I suggested. Is it a race condition possibly based on someone else editing the file at the same time?
Once, I figured it out, it was someone rejecting it, but another person taking my edits and proposing the same edit. (I talked with the editor, and this is the case.)
I find it strange behavior. And it doesn't happen often, but when it happens, The times that I have noticed it, other than the one I talked to the editor) they have had a 3k+ reputation.
But it also counts as a 'reject' even though the changes were ultimately accepted due to the result, though not the mechanism.
vgoff had 10 edit suggestions approved, and 1 edit suggestion rejected. Anyhow, comparing this to the actual edit that happened on the post it appears they are different. So, the chance is high that the other editor was editing the post while you submitted your suggestion; thus rendering your suggested edit as rejected since another edit happened. I don't know though whether this is supposed to happen, when two editors work simultaneously this usually gives a warning of some kind when the second editor tries to submit.