Before this incident happened, I was approximately 52.7k. I went to play a run of Remote Control on the 5.4 star difficulty, and didn't even get a half combo. After the map, I noticed I got the under 50k achievement and that I was 49.1k now. Yet my pp is unchanged, and I have no reason for getting this immense amount of rank. Does anybody know what is going on or what the cause of this may be?