Having problem with blueprint model shadows.

Hi there, i apologise in advance if this is a simple fix but i’m fairly new to the engine.
i dont want any indication that these are doors to passag
So im having a shadow artifact problem between regular static meshes and blueprint models. Im prototyping a small modular game with incognito wall/doors (secret rooms) i dont want any indication that these are doors to passageways (not subtle lines or anything). So i have only modelled the one wall and duplicated that for the incognito door which required a blueprint to open and close. The problem is, is when placing the blueprinted wall/door next to the static wall i get a weird artifact that i cant seem to fix.065361bb5ebaafb8af5eb45d7db43b388cb13972.jpeg

again I apologise if the answer is obvious.

Thanks.