The problem you have is being caused by the little groups of faces as shown by @whiterabbitdesigncompany, they are so small and only slightly angled from each other that SU is struggling to understand them properly and is adding faces on faces. You can select some of the faces and delete them and you’ll see the other face remains. It’s an unfortunate oddity of SU that sometimes it creates multiple faces for what appears to be no reason.
Using the Dave Method would avoid the issue.
In this particular instance, exploding and regrouping will fix it, or even converting it to a component.
