There was a question I remember voting to close, but my vote doesn't show up on the closure banner:
My vote was cast about two hours before the mod closed/voted it.
If you look at the revision history of the question, you'll notice that the question has been closed by you and a moderator:
but later on it has been reopened and reclosed:
and since you didn't take part in the last closure, you're not attributed in the banner.
Incidentally, if the ♦ moderator disagreed with you that the question is primarily opinion based and wanted to make sure it didn't show in the banner, they could have just voted to close as "unclear what you're asking" since the reason a ♦ moderator chooses unilaterally determines what ends up on the banner.