They also put two of the rubber stoppers that keep the vibration things in place on one side instead of one per side like it should be. I dont know, I felt very rushed there like they just wanted to get me out and move on to the next customer.
If I'm following you correctly on this comment those aren't stoppers intended to keep the silencers in place. They are cushion buttons (similar to Eliminator buttons) that are intended to be used as a cushion for your release against the arrow nock if you intend to shoot directly off the string.
They are a factory item and they are supposed to be on the lower half of the string and used one at a time. As the first one wears out below the nock from shooting you slide the next one in place.
If you are planning to shoot with a string loop you might as well cut them off entirely as they serve no purpose at that point.