I would not worry too much about it. First of all, mining prices vary around the world.
@kingscrown
Secondly, there's going to be many reasons for this and that in crypto, but sometimes the market doesn't follow reason. There's arguments for everything.
When things go down, people say its manipulated, when it goes up, suddenly it's growth. When it goes up 5% after going down 10% people proclaim bottom has been reached. When it goes down, some people say what a blessing it is to be able to accumulate at these cheap prices.
I think the only question you should ask, is the price of the coin I'm going to buy going to be higher in the future than now? If yes buy, if no, don't buy. YOu choose your own time scale. If you think you can get a better deal then wait.