Sorry, I was not clear. I did see your screenshots - where did you grab them from? I cannot find a list of sales by category like that on the site (though I admit I spent only a minute or two searching). Can you drill down from those categories to see all the titles within it? That way we could check and see if any items are listed on both lists (well, at least for the highest categories - the counts get too big for the lower ranks).
I don't know if items are double listed (they definitely would not show DM's Guild items on DTRPG), but I do know I have put DTRPG items on my wishlist and bought them later with some DM's Guild items on the DM's Guild site. I just wonder how those DTRPG items would be counted for sales that way?