@Starlite with the pop-up for Traps, is the trap applied still when you enter the battle?
And does the pop up ever appear later at all, as though it’s just delayed?
I’ve experienced this myself recently as well, but when bug testing and time travelling so at the time I thought it was related to what I was doing.
As for the Stairs, does the door still display as unrevealed or does it show the stair icon?