Hi
@ArmadeusK
You are wondering how it is possible that some videos have 9000 videos on 1 moment, and the next it gets reduced to a mere 1000.
Like others have stated YouTube does a clean up in views every now and then. They do this to ensure that no-one is getting more views in an un-legitimate way to earn more money. If YouTube has serious doubts about the authencity of some views they have the right to remove them. I assume this happened to your channel.
Mind that this doesnt always mean youre viewbotting, but if you refresh your videos a lot it will add some views but they will be removed later.
I hope this answers your question!