How does this not make sense???
It makes perfect sense
What wouldnt make sense would be Hodor living a normal life, Bran warging him in the past, and in the present Hodor turning into his hodor self and holding the door.
That would be way too convenient.
The fact that the timeline doesnt change (i dont agree its circular, its linear with the ability to go back and alter things but that changes the linear timeline, which only exists if you go back yadada) means there can be no lets go back in time and change time, no back to the future bullshit, it's fundamentally more real and serious because the past cannot be changed