Shadows on textures

[fifafreak18]

On a wad im working on at the mometn i have a room with three doors, im using doombuilder btw, i have only made 2 of the doors because when testplaying the map the doors are shrouded by "shadows". The texture is SHAWN2. I don't know if its the sorrounding area or lights or what not but does anyone have any advice?

Thank you in advance.