You have to remember that the market is huge and there are millions of trades taking place simultaneously for a multitude of different reasons.
One extreme might be a pension fund placing millions in a new long term position or a company funding a massive project in another currency - and at the other extreme an algorithmic-based automated trading program buying and selling huge positions for a few pips.
Then there are the likes of us here on BP whose position size is about as relevant as a fly dirt on the side of the Empire State Building - the retail trading community. As a whole, there are probably as many traders buying and selling at every pip as there are trading scenarios. Some are entering , some are adding, some are closing etc, etc, etc.
You are just seeing the vibrations in the waters as the markets vibrate in tune with all the variations taking place. On a seconds-based timeframe there is no logic behind the individual swings whatsoever.