I received my LI Quad from Cliff on Saturday (quick shipping BTW) and today I opened them for the first time and noticed that ALL of the heads had some scratches/"glue" residue on the transmitter and this gray round scratch by the receiving bubble. I tried to take a picture of it but it's really hard to get it on camera. Anyone else got their LI heads this way? Will it affect performance? Is this pretty much standard? Thanks!