Odd (maybe) darkling behavior

[Nerdlawyer]

So I recently added a couple of pieces of dog kibble to see if my blue death feigning beetles liked it. I also tried a couple of pieces of fish food. Typically I give them vegetables, oatmeal, and sometimes fruit. I noticed today that they have not eaten them. Instead, they moved them from the corner of the tank where I put the food (bottom left in the bird’s eye view picture) to the farthest corner, behind a piece of cholla wood (top right). They also moved some little “tumbleweeds” over to block off the corner. Is this normal behavior? Any guesses as to why they are doing this? They don’t seem to have eaten much if any of them so I kind of doubt they’re storing it for later eating. Maybe they hate it and are trying to get rid of it?