I've been deranked for no reason. Ps4

Aaron10

So basically I've been deranked from rank 5 with 4 pips down to rank 9 with 4 pips. I noticed instantly when I got on dbd the next day; I had been playing the night before and I remember that I had bought 2 items from Jake's bloodweb previously and they weren't purchased when I checked his bloodweb again, idk if it was part of the deranking or not but, is deranking a punishment of some sort? Or is this an actual bug? I know rank doesn't really matter as much but it still resembles your skill in a way.