Weird Shutter Door

I have a question: For the most part it is fixed, but on one screen, I have an Oval Patra, and the flags "Enemies->Secret" and "Enemies->Secret is permanent" are checked. The left and right doors are shutter. When I kill the Patra, the doors open as usual, but I cannot go through the right door. I can go through the left door, though. Do you know how to fix that? I am using an NES dungeon D-Map, so that is not the problem.