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From the look of your desktop I'd say you may have a mix-up with Candybar or the likes. Check any programs you have used to change icons and relaunch your dock, or try restarting.

EDIT: Nevermind. Glad it's fixed! 🙂
 
Thanks. Worked for me, as well.

Can't believe how long I spent stressing that my application folder had an icon for 1Password app on it. OCD is tough thing. Thanks Repo for the answer. Ahhhh, now I can finally relax.
 
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