You have 2 lights in 2 different rooms that each work off each wall switch and they are not hooked up as a 3 way switch?

Can anyone tell me why? I rewired the upstairs and I know it is correct. It is an old house that had the knob and tube wiring. Alot of the rooms are on one circuit as I havent had time to split them up. The 2 upstairs bedrooms, 1 downstairs bedroom, Living room, dining room and bathroom (light only) are on the same circuit. However, only the 1 upstairs bedroom and the light in the bathroom are affected. If I turn either of the light switches on, it turns both lights on. If I turn the bathroom light on, the light in the bedroom comes on and does not shut off with the bedroom switch, no matter if the switch is in the on or off position. The same goes for the opposite, cant turn off the bathroom light when the bedroom light switch is on. The bathroom light still has the old knob and tube wiring as I havent gotten that far in the wiring process and so does the downstairs bedroom, however, I cant figure out why the only 2 lights affected are the 1 bedroom upstairs and the bath if all of the other lights act normal. There is only 1 main power feed to all the upstairs Would it be because there is no ground wire on the bathroom light fixture? Its just 12-2 to a junction box and the knob and tube wires are spliced to it in there.