I built an indicator and it is acting funky on the 4hr timeframe.

I have lines that I am plotting but for some reason they go vertical. Works great on the lower time frame (which is what it is made for) but just wanted to pick your brain on this. It is just weird. The goal is to catch these fake-outs as the session transitions from regular to after-hours. I noticed that when the session begins, big players take out one side of the trades (determined by the line break) and move back the other way.