When voting to close as a duplicate or as off-topic, there is a separate set of options. If you have already voted, you cannot see what those options are anymore. This makes reevaluating your close votes impossible to do. If you don't remember what you voted for at the time, there isn't even an indicator on what you voted.
If voting to close as a duplicate, sure a comment is automatically added but it's a comment, it can be deleted. Other people might agree with the duplicate votes or select a completely different question. It's impossible to view the vote counts on each option.
The questions and vote counts should be accessible in this dialog after you have voted.
Likewise, when voting to close as off-topic, it's impossible to see if there is a consensus on the voting. You can't see what reasons people voted for as off topic, not even your own.
We should be able to at least look at the off-topic reasons and see the vote counts.
And finally, it should be made obvious which reason you voted if you voted. Right now, it's impossible to tell.
There should be a clear indicator on what reason I voted to close.