The cartridge being upside down is the issue. The handle often fits only one way, but the handle position itself isn't the issue, just an indicator. And, if the normal rotation is from off at the 6 oclock position, to super hot at the 9 oclock position, then it's certainly possible that the rotation is the same, but the off is at the 12 oclock position because the cartriges's openings are offset from where they are supposed to be.