I'll say a baseless but true feeling that I think someone or an institution is controlling the bitcoin price.
The math here goes against that statement and you are free to believe what you feel is true, but if you can't back your belief with evidence you should be skeptical about it in the first place.
Thinking that some big thing is behind your loss is a common delusion that people have but the truth is that Bitcoin is decentralised and no one address controls to anything here.
If you dwell in trading for too long without the proper mindset these thoughts come in more commonly so keep a watch on your state while you trade.