A friend of mine think they are liquidity gaps so the algo don't lose time on that and go for the sauce. That could explain why later prices are moved back to that zone to build any TA pattern that entice bets.
One thing I want YOU to think is:
DaBoyz need a net or grid of levels so in any minimum movement they can win.
However, they are subject also to the rules of the game, if they win the player in the right side of the trade also win. They can't avoid it but they can minimize it. So if they want to go up usually go down to the closest longs to eliminate those.
They know that there are break out traders, Support and resistance traders and Fib. traders. In any swing they know the psychology applied (actually taught) by those players and THAT is built in the algo.
Happy weekend