I did the same thing not too long ago and saw Wedge was piloting a Red 2 marked X-wing at Endor. I think that might be just something to do with the production - similar to the special edition, the fly by of the X-wings and all of them were marked as Red 2. I remember another mistake, the scene just before Luke meets Biggs in the Yavin hangar, he runs his hand along the bottom wing, and you can clearly see there's one stripe, Red Leader's X-wing. They have their chat and Luke climbs into that same X-wing. Jumping the gun a little, Luke?
Its definitely interesting for sure. To me though, it would make more sense Wedge's X-wing be marked with one red stripe, seeing that's how the markings were in ANH.