This is happening since yesterday, why are you seeing this just right now? If you are not updated at all, let me tell you that bitcoin touched less than $11000 during last night.
And now it is recovering, it is a slowly process, but it is doing so, so dont worry about the prices, they will recover sooner or later.
It is not about decrease or increase, it is about the same exact pattern for all four. It is unnatural. Some major players are playing the market.