Strange brick wall anomoly in X17

[PitMan71]

I have done several brick homes and for some reason on this one I am having some kind of strange thing happening at the corners. The brick wall is extending down into the foundation brick creating block looking artifact on my elevations. You can see it in the image I posted. the wall is set to not extend so I am not sure what's happening and I have checked other brick homes I have drawn with the same method and none of them are doing this so I am not sure what is causing this mystery.

 

thanks in advance for looking.

 

link to file --> https://www.dropbox.com/scl/fi/2e0rhz16wyi68ykdnuigw/260005-21A.plan.zip?rlkey=z1z8gw05omixm6e4yay0802d5&dl=0