Help. Just purchased 2 dozen Spynal Tapp arrows. Shot them for the first time tonight and lost 4 cock vanes. They are the 3" Vmax and have a lot of helix to them. Thought they may be contacting rest but don't see how. All of them fell of and lay by the target at 50yards. Anyone ever have problems like this? Hard to trust them in a hunting situation. What am I missing? Any help appreciated. No evidence of contact on the vane. They look new but just fell off.