Further to Voting to close on a question you already voted on results in a blank dialog, the iOS app's interface for "already voted to close" could still be better.
This isn't a super-helpful dialog. It's not really a "problem", it's an expected result of the fact that I've already cast a close vote.
The app should tell me exactly what's going on: I've already voted to close, and thus cannot vote again.
Of equal importance, it should also allow me to retract my close vote. Before retracting, the app should warn me that no other close action can later be taken. If I attempt to close vote again, the app should tell me that I've already voted to close and retracted that vote, and that I should raise a flag if something still needs to be done.