Why couldn't I beat Holy Hell?

Imagine at the end of your 5 hour plus playthrough of a brutal doom map, some inexplicable bug occurs that prevents you from being able to beat the map, well that's what happened to me.(Just to preface, I played in DSDA-Doom) Normally at the end of Holy Hell you go through a teleporter which sends you through a teleport sequence that leads you directly to the end of map, but for me those teleporters didn't work, and I have no idea why. At first I thought that monsters must have passed through one time teleports and caused them to disable and indeed they are one time only, except for the fact that the lines are also monster blocking, making this explanation impossible. What confuses me even more is that when I start the map from the beginning, the teleport lines are green on the automap (showing that they are teleporters) but when I reload my save from near the end of the map, the lines are not green, meaning that something must have used them at some point between the start and end. So that begs the question, what could've possibly broken these teleporters?