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Do the 'DownUp' appear when you scroll mouse wheel?
In my case this happens, when I scroll through the list of the last entries in the tool search input field!
The 'Up' and 'Down' represent the Up-Arrow key and Down-Arrow key on keyboard. It seems wmb up/down are linked to these two keys in your case for some reason. Just click these two buttons and see if it goes away.
It is not a problem with my config/preference, as I have the same problem with a new config/preference file(s)
I think it's something in your system setup.
What have you assigned to X key?