Master bedroom light switch is controlling the bathroom too?
It sounds like the wire from your bathroom ended up in the wrong place, the good thing it won’t hurt to swap them around until you get the correct combination. The back stabs or quick connects are electrically connected to the screws so the hot and the line to the bath were connected, your job now is to move your wires. There should be at least 2 cables where the whites and grounds are connected and the blacks come to the switch, for the travelers there are lots of combinations but your always hot and the black to your bathroom should be on the same contact if 2 hole lugs or pigtailed together to the common of the switch. But as long as you only swap the wires on the switch around you will get the right combination in a few try’s.