Everytime I turn the compost in the bin, once every ten days or so, I notice that almost all worms are in the corners really close together. Lots of them. They are not trying to escape, they just always feed there.
When I put a tray on top they get to the rest, because I've harvested a couple of trays, but I never find them in the middle of the top tray.
When I put the organic material I spread it evenly on the whole surface. I do not add dry grass or something like that, just the kitchen scraps and shells. I have one of these compost bins.
Is this the normal behaviour for worms? Should I be worried?