If stages are added to the game, it makes sense for the completion percentage to drop a bit in order to cover them. It could be the new seasonals or that it now takes the RedBull challenge into account.
This 'glitch' really didn't need fixing. It was great advertising in a way because the extra % signified extra content PD has been adding to the game. As time went on, the earliest players would have higher %'s than newer players because they would have seen more seasonal events.
I have %101 complete so when I update to 1.03 it become less? I haven't updated yet because I am busy with stuff and I can't play right now.
Like you said I think it because of new events which gonna be available in future update (like the red bull events).