That's surely looks like a default terminal buildings so, it's not coming from our scenery but, most likely, a duplicate AFCAD which is taking precedence.
First, be sure you have KDFW on Top of every other layer in the Scenery Library (which is where the installer puts it by default)
Then, use any of the already mentioned .BGL scanning tools, to find if you have other AFCADs files for KDFW. Note that, they usually come with AI traffic packs (like My Traffic, for example) so, you might have one, even if you don't recall having it installed yourself.