Nope, none of the apps affect the RNG for wild pokemon. I always do that to make sure I don't go over 128.Does switching to the step counter app and using it to count the steps messes up the rng?
Edit: Oh, and check if there are multiple frames with the same IVs you got, frame 37 might not be the only one so you really may not have hit that frame. Chances are you were only off because of the turn/steps issue.