First off you can't blame the Blazers for falling off your arrow. Its the person that put them on. Secondly during practice you noticed your fletching didn't last long. That should have been a hint that you'd better check all your arrows.
It is very likely that whoever installed the vanes did not use enough glue or used glue not designed for carbon arrows. A little tug on each vane would show if it would come loose or not.
BTW - if that buck did not see you after the shot and you did not hit him it is very possible that he will come back. He may have gotten scared but don't know what it was that scared him. If he saw you then he may now become nocturnal and you might not see him again until the rut.