I make 1/2" cutoffs using a small sled for a particular small part I cut for a non-profit. Never had a problem with the the offcuts getting shot back at me. Until recently, when I went with a newer Freud rip blade. Same part number as the old blade, but there is a difference in the shape of the gullets. That blade threw 3 or 4 of those cut offs at me in short order after starting a session. The blade was the only difference so I put the old rip blade back on and no more problems. So, a long winded way of saying, it could be the blade. As suggested, try a different blade if you have one.