Black lines at the openings for windows and doors

[Dylan]

Good afternoon folks,

 

I have a weird thing showing up to all my doors and windows. There are these thick black lines at the sides of the window / door symbols. I never noticed it before because I had my data visualization set to make the existing walls 80% black. We changed the graphic representation and went for a 50% black and now these show up at every door and every window. They appear to be "under" the window / door symbols. The "Draw wall lines" is turned off and the lintel and threshold classes are set to an invisible class. I've also looked into the wall type to see if there's something class wise going on there but everything is set to colour by class which has been modified with data visualization.

 

Any ideas what they are and how to turn them off?

 

Thanks folks!

- Dylan