If you look closely at the recordings, without buffer starts with (neutral, "Y", Hold 4 frames) The one with a buffer as (neutral, , 5 frames, comment: Start Buffer)
Without buffer, doesn't always fail, and doesn't always drop inputs in the same way. They are always at the beginning, neither has had issues further in.
"If you are pressing f7 to play the sequence it could be causing weirdness."
This seems to be the reason. Using a hotkey results in perfect playback, while using F7 on the same recording results in the previously experienced drops
As for the training window, it as more fluke than anything, I just had it open when I was trying to record something new.
Thanks for the quick reply!