Usually its the way they sit on the copper Busbar, as the screws tightened clockwise they sometimes twist, when fitting sometimes if you hold them wonky to the left to start,then they line up better, once ones wonky usually the others follow especially if they loaded up from the Left main switch, but sometimes there just impossible to get straight, so dont worry.
As for the sticky one, it was likely the internal mechanism would still operate, independant of the switch bit moving freely or not, so again likely no real cause of concern.