I try to upvote for this question, but SU system message says:
Vote too old to be changed, unless this question is edited.
I have never voted for this question before, so this seems like a bug which doesn't let me vote. When I click on 0 (vote count), there are 0 upvotes and 0 downvotes. Anyone experiencing this kind of error?
(The same error is generated when I try to downvote)