Sort by active broken on this instance? - sh.itjust.works

Is it just me, or is sort by active worse on sh.itjust.works than on other instances? On sh.itjust.works, it gives posts (both local and federated) that are weeks old. If I do the same on lemmy.world, it gives much more relevant posts that are a few hours to around a day old. Maybe there are some server settings that could be tweaked?