Clearly no one here can say what it is for, so if everything seems to be working, the best idea would be to leave it as it is, AFTER taping up the male bullet connector to cover as who knows if it could go live if "something" was turned on and could short against the radio case or any other 0V/Ground point.
FWIW, if the terminals have been fitted the right way round, then it would be likely wires that connect TO a supply, rather than wires that PROVIDE a supply. The female bullet connector is connected to the white wire with the black tracer. With two wires of the same colour, the black tracer on one would typically be connected to the -ve.
So a Female on the -ve and a Male Bullet on the +ve means that if this were a supply, the +ve terminal would be exposed and easily short against a metal ground part. (when using bullets, you would always use the female bullet on the supply +ve wire).