I have 5x5 redstone lamps in the air(nothing nearby touching) with open wooden trapdoors on the sides.

When I place redstone wires on a lamp without powering anything, all trapdoors touching the lamp close back up. Removing(and placing them again) the wires don't open them again, even if on another block touching the trapdoor. Rebuilding the structure doesn't get rid of the problem. Debug screen shows the wire's power:0.

I tried with some other devices such as doors, fence gates, etc and there wasn't a problem. I don't know if this is a property of redstone lamps but it doesn't say so on the wiki.

I have some issues so I cannot provide a screenshot, sorry!