Section Fill is having issues on floor plans

HI all, just wondering as to why a wall in the section view goes white and not grey.

I’ve tried the following;

  • material on the floor and the walls
  • Fiddling with the styles

It goes white in the section when i delete this line for the wet area.

Share the file. Otherwise we can only guess.

The auto staff thing on here removed it for some reaso. ill try again soon