The wall face and the edge must be out of alignment.
You could add your model so we can check it for you and give a fuller answer.
how do I do that
Drag and drop the file into a reply, or use the 8th icon from the left at the top of the reply window to attach it.
As stated in the post above yours:
BergåMod1.skp (667.9 KB)
The hole was not pushed through to align with the other face.