You shouldn't be skipping more than one grit at a time either. If you're a DIY you should probably be sanding with every grit home depot offers: flatten/strip with 36grit, then use 60 grit, move to 80 grit, and finish with 100 grit. Then sand with a random orbit palm sander 60 grit, then finally hand-sand with 60 or 80 grit (depending on wood species). Then you want to use a buffer (I like a rotary one but DIY would fend better with a square one) at least one pass with 100 to 120 grit paper/screen to blend edger work with drum sander work.
Gary's right though, the scratches are there because you don't know how to use the machines. When I used to work for the "big" hardwood companies before I started on my own, we'd sometimes look at a new construction floor and if wasn't to hacked up by the other trades we'd turn to each other a yell out "ONE CUTTER". This meant we were going to edge using 80 grit only, hand-sand, buff and stain. Floors looked perfect.
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