In the settings interface, on the “Sort Type” box, there’s a question mark one can click to explain the different sort modes. It leads to a 404 page. I think the actual page it should lead to is HERE. Sorry if this isn’t the correct place to post this.
!lemmy_support@lemmy.ml might be a place to ask as this might be a Lemmy bug. We should also check if other instances have this problem.