I was given the impression that the center of the player is where a trigger happens, but it seems like in my case it's triggering if even 1px of the player's size crosses the line. However it seems to only affect the lines on the sides and not the one in front of the player. It's like the side of the player can trigger a line to his side by moving across it even though the player is not at the center.
Consider this image:
The trigger lines are front side only, but as you can see the tiny red section I marked over is front sided towards the left side of the player but the center of the player is nowhere near the line. Why am I able to trigger that tiny red section? In all my time mapping and doing things I've always had to have the player actually be over the line to trigger it, not a tiny touch of the very edge of the player radius. Speaking of which, the radius of the player is 17 instead of 16. Could this be an issue? I made that change to prevent glides but I can change it back if this is what is causing abnormal behavior if it is such. Or is this normal behavior and I've just never experienced it until this specific scenario?