Essential what is going on here is small retail investors are piling into poor quality stocks that by all rights should be going down in order to artificially boost them up. It is inevitable that many people will get burned. In the stock market there are 2 parties to every trade and for everyone buying and selling at a profit there has to be someone on the other side trading at a loss.
There is a wider story about hedge funds and short positions but don't let that distract you from the fundamental above.