EDIT: Badger helped me out. The problem is that my vertices were not connected. To fix this, I deleted the big grass triangle sector that leads into the cave mouth sectors, and actually used F2 and drew out the cave mouth sectors into the grass.

Hey guys, I've recently got serious about Turok mapping and while I understand sectors and how they work, I seem to be running into a strange issue with them.

My sectors are connected, I have validated the map and they have no errors, and if I spawn the player on the cave sectors you can move inside just fine.

But for some reason, the sectors are completely separated and I cannot walk from the grass to the cave, or vice versa. I have absolutely no idea how to fix this, been trying for over an hour now. I've recreated the sectors both with F2 Sector Reaction and Ctrl+D Drawing mode and nothing seems to work.  Any help would be appreciated.