That's a bug. The categories keep moving around, I'd guess because SMF is relying on undefined MySQL behavior that I messed up by switching to a different version of MySQL. I will fix it in the near future.
I am not sure this should be considered a bug. Pretty much all altcoins are trash (with maybe enough exceptions that can be counted on one hand). Even these exceptions are already pretty well known outside of bitcointalk so I personally see little reason to keep the
altshitcoin section anywhere else then the very bottom.