Rockers installed wrong

Wrong side - Hmmmm
Wrong orientation me thinks - as stock rockers have a left and right stamp on them for a reason. The end of the rocker that makes contact with the valve tip is offset left or right to align with the vale tip when assembled on the shaft. you need one of each to alighn with the intake and exhaust valve tips. It might cause the tick - it sure will wear the valve tip ends and excessive side load pressure on the valves on the ones that are incorrect.