Whenever I plug my Bezzera BB005 into the outlet, it creates a short circuit. Does anyone know what it could be? I haven't dropped it or spilled liquids.

Get someone to help you to safely disassemble the grinder. A live electrical part is touching something that it shouldn't. Or some wires could be melted, or the motor may have packed it in. Yeah, many options.
It may take a very trained eye to pick up the fault.
D.