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Both are possible, though sometimes it's just a healthy vigorous chick. If it's a problem, and the store will take it back than maybe that's a better option for your situation.

85 degrees could be too warm, I would try lowering or even eliminating the heat if they are somewhere warmer. That still can be tight for an active chick to burn off extra energy.

How big is your brooder? What temperature? At 3 weeks chicks need room to run and things to keep them busy otherwise they often start pecking each other. Mine go outside on the lawn daily in a temporary movable pen. You can take a piece of fence wire and make a circle to separate it out temporarily.