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hmm...
What exactly do you mean by "app drawer"
optional window from the Dock? - or in the Launchpad window?
or some third party app that you have installed?
 
Ahh, OK, Launchpad!
(I don't recall if Apple has ever used the term app drawer, so had to make sure of what you were asking :D )

You can probably clear this up with a simple cache clearing. Some system utilities can do that for you, but just as good to drag your user folder/Library/Caches folder to the trash, then restart.
 
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