hello master solidwork, i've a question, please help me cause i'm a amateur student who studying solidwork

i want make the outgoing rack motion on my design,

at first i made the motion on motion analysis tab, then set the gravity to the down , in contact window i select all the parts and just i set elastic properties on restitution coefficient at the end the result become as you see in video.

for pipe i didn`t make mate just i put the pipe near the rack.

so how can i fix that problem? i do something wrong?
thanks for your attention