I've tried adding "don't link" on all the doors.
I did a video just so you can see exactly what's going on.
https://www.youtube.com/watch?v=9ZOH1YmMnNo&feature=youtu.be
there are 3 sets of doors, the four downward-moving doors (d1); the doors above d1, which the player gets launched up through (d2); and the unnamed door which is off to the right and there's nothing special about it.
I've tried creating a new single func_door away from the others with no changed properties, and it still opened.
I've also deleted and redone the button to make sure I didn't accidentally change a property.
if it turns out to be something really simple I goofed up on plz don't laugh at me ok?? <:l