Problem with windows with push/pull

I am very new to Sketchup, and in my first project i am having problems with cutting out windows using the push/pull tool (see my problem in the attached picture) It does not seem to cut all the way through, even though i have alligned it with the other side of the wall. Can anyone please help.

Most likely the window plane is not parallel to the wall plane.

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Or the far side of the wall is not parallel to the near side. If you upload your skp file here, we can tell you for sure.