I had the same problem, but mine was the mounting bracket was loose. Dont know how that happened, but was hauling bow up to stand and it caught on the step and I saw it cock eyed. I keep a set of allen wrenches and etch where I have my settings, so I just tightened it up on the mark.

Im so frustrated with my Muzzy's. Im shooting low and left by 4-6 inches. Im dead nuts with my rages and NAP's, and field points...but Muzzy's are going to end up having dust on them by next season. I dont know if my fletchings are offset to cause it, but regardless I am not shootingthem anymore. I have had to adjust my sight just for them and that is a no no in my book, especially when I have two other brands that fly like FP's