I think I got the idea. Seen this pattern somewhere else.
There is a bot that rise the price,  and lowers the price under certain criteria.

Rise,  to sell higher. (what has in stock)
Lowers,  to force you to sell quicker.

The idea is that the system always has profit. Is Jiggling with the price all day. The price won't go higher because as soon as someone buy a significant chunk,  the price will fall (the bot controls the market as well as buy/sell orders).