Part of the wall is disappearing

I am constructing my building, and when I go to insert a window, the wall across from it in the space is disappearing. Does anyone know what is going on?

Before window is inserted

After window is inserted

Best reply by Sebastian

Hi Tiana,

Your window's geometry seems to intersect the wall perpendicular to it. Please move the window slightly to the right so it doesn't intersect the perpendicular wall, and the opposite wall shouldn't be cut.

Kind Regards,

Sebastian

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