That rounded top on bitstamp looks really weird
What's so weird or surprising about it?
All this BTC trading activity of the past couple of days is taking place with very small volume (absent the 3k coin dump on Bitfinex), so in that regard, the trading pattern can easily take almost any kind of form within several percentage price fluctuation at a very low cost. In other words, low trading volume facilitates an environment for relatively easy pushing of the price in nearly any direction that is wanted at very little cost... that ease of manipulation does not necessarily mean that manipulation is actually taking place, but only that in current market conditions, manipulation is quite easy to pull off through the use of very few coins... and accordingly, can create almost any kind of pattern/image, like a Rorschach test.