This is also happening to me. I think this happens if Roblox thinks that you have a touch screen, which happens to change/break some other website features (for example, “Currently Wearing” on user profiles won’t display page dots).
If you load the website on mobile then you can see this in action. You can scroll through the sorts by middle-clicking, or by sliding your finger across the sort if you actually do have a touch screen.
But the thing is, I don’t actually have a touch screen monitor. As of recently, Roblox thinks I do, for whatever reason.
