I have been observing a trend from last year bitcoin price movements to this year movement.
I have observed how we're getting so much positive news and adoption about bitcoin this year, but still the prices refuse to go up. If this was last year a single positive news will have pumps the prices by at least 10% or more.
Its that positive news don't longer have any effect on the price movement or is their any manipulation going on.
It really depends on what positive news you are referring to, some positive news doesn't affect the price immediately but does an impact to the audience who's reading the article. Therefore, they will tend to buy or sell depending on what was the current news trend they were reading.
The reasons of ups and downs in the market are quite uncertain as well , like they are really unpredictable. However, there's also a part of market manipulation which influences the market.