Bent pushrod, what is the cause?!

hey guys thanks for the input. I graduated college this weekend so ive been busy with other things besides the car. however i did re bend the pushrod straight and will try to throw it back together and see again. the only thing that confuses me is that i took the head off and cleaned it and replaced the valves.. figured it would not be sticking anymore. Ill give it another try though and let you all know how it goes.