Don't deserve "Additional tax on IRAs and similar accounts"

My tax summary indicates "Additional tax on IRAs and similar accounts" of $462 but I can't tell why. 

Can it be related to the excess contributions to my traditional IRA and Roth I mistakenly made? I contacted my broker immediately, who indicated they couldn't block the transfer, and advised me to file a disbursement for each, which I did. This is represented on the forms so far.