Old QO panel that's probably overloaded/added to/ no spaces left/ etc.
Pretty much, house is a very small cottage that has been added to over the years . Someone before me stripped out the last space on the neutral bar rendering it unusable. Thats why i added the neutral bar with a #2 copper jumper between the bars. I demoed a 15a circuit that used to feed the bathroom and used the spot for a 20a circuit. Pulled new 12/2 nm to bath. Only serves this bath so i fed the vanity light and exhaust fan off the line side.