I don't think the deer viewed your set as a scrape, but it could be possible. There are two likely causes of deer investigating your sets. One is urine. Deer are attracted to the salt in the urine. I have seen instances where deer liked the sides of dirtholes slick trying to lick up the salt.
Another more obscure problem could be tonquin in your lure. Tonquin is an aisatic deer musk that is attractive to canines. However, I believe it is attractive to deer as well. In this case, maybe the deer did think your set was a scrape.
You should try to avoid using urine where deer are present. You might also try using a different kind or brand of lure.