I need help with an issue with making levels. [FIXED]

So I've had no issue until now. Suddenly, I'm having a door problem.

The door won't open, rather, for some reason or another, it decides to just lower a bit, then eventually make the "closing" sound. Does anyone know of a way to fix this?

It's connected to a sector which top ceiling is the same level as the door's floor.

you might wanna check if the longer linedefs are facing outward, and if that don't work open that current doors sector and create a smaller sector inside counter-clockwise.

Yeah that fixed it up. Thanks.