How old is the bow? And does it have a slider to keep the bow strings out of the way? My old bow did not and I had to turn all the nocks so the colored vane was away from the bow to get clearance from the bow string.
Nock your arrow and then pull it straight through the rest and see if it hits the strings or even the bow itself.
It also could depend on how old your arrows are. The cheep Walmart arrows won't last longer the one season through a WB.