Bar POPS off back on squat concentric?

Hey, whats up guys!

I got a question regarding the squat. When i drive up, the bar always bounces off my traps. I try to be explosive as possible and the bar always seems to jump up and land back on my traps even on the last rep(AT THE SAME EXACT SPOT). HAHA so this kinda motivates my to push harder, because i know i am driving hard.My form is correct aswell, being tight and gripping the bar hard.
My question is though will this be harmful to the spine?...I mean having the Weights bounce up and land back on ones back?



Thanks!
P.S. This is my 5 rep max weight, so dont assume the weight might be to light and tell me to just increase the weight. LOL