Pending order doesn't work

I had mixed feeling about this broker, so before I starts trading with them I decided to ask around. But the response I get from other traders is quite confusing. Some of them say that IC Markets is great, while others say they have been conned. So, I decided to try them out by myself, I start out with a demo account like the typical trader I am. It went on okay, with great spreads, no slippages, etc, then I moved to a real account. But, the problem starts when I trade NZDUSD news. 

I put a pending stop order at 22:55 pm, news came in the candlestick didn't move and just stood there for 3 minutes. Luckily, I also open the same positions in another broker and its moves, so it wasn't the market. Then suddenly my order got opened after a 121 pips downward move when bearish run had finished, instead of banking 121 pips profit. Obviously, I was forced to close positions and I literally don't know what just happened. Are they really manipulating the prices?