The guy also mentioned that I shouldn't have my arrows cut shorter than my draw, which is obviously what I thought. I have never bow hunted or owned a bow, so I was going off what the sales guys was saying.
I've been shooting 27.5" arrows from a 28.5" draw length for about 28 years now. Broadheads are almost always 1" away from the rest when I am against the wall. When I shot 28.5 to 29" arrows I was always getting dirt in my nocks. So I made the switch when bow manufacturers started manufacturing risers cut well past center. Unless I plan to shoot a broadhead more than 1.25" diameter...No problems!
AMO draw length of 28.5" is equal to a true draw length of 26.75". Biscuit rests are usually at least .5" further back than that. So that's 26.25" or shorter distance to the rest. I could shoot 27" arrows and still have 3/4" to spare with a biscuit rest. Assuming I don't try to hold my arrow on the rest with a finger

So obviously the bow was not set for the proper draw length or the arrows were cut WAY too short. Or, of course, some dill weed could have put the rest on backwards! Wouldn't been the first time that's happened.