which instances?
some are just under-powered and cant handle the influx from big places like .world. then sometimes when theres downtime, it takes an extra amount of time to ‘catch up’
.world will also stop trying for 24 hours if it detects a sync failure (no connection, etc) for long enough. moist.catsweat.com is up to date.
looks like something is up with lemmy.ml -> lemmy.world
https://grafana.lem.rocks/d/bdid38k9p0t1cf/federation-health-single-instance-overview?orgId=1&var-instance=lemmy.world&var-remote_instance=lemmy.ml&from=now-2d&to=now&timezone=browser
seems specific to your instance.