If you are referring to the sides leaving little stripes in the gravel or dirt this is a common thing due to the weight of the implement in soft material be it dirt or gravel. You can reduce it somewhat by elevating the front 1/2 to 1 inch with the top link but the marks will not disappear totally. Mine does this same thing so at times I just drive over them with the tractor or truck wheels to push them down or, I live with it.
Ricn