Having feed set to 'Hot' in both Subscribed and All show posts that are over 7 days old and not updating.

https://sh.itjust.works/post/259727

Having feed set to 'Hot' in both Subscribed and All show posts that are over 7 days old and not updating. - sh.itjust.works

Just wondering if there is a way to refresh this to get the actual ‘Hot’ posts. In the meantime I’ve switched to only ‘New’ but that feed gets flooded with migration posts.

I believe it's a bug in Lemmy itself that will be rectified in the next release. For now, like you say, just use 'New'.
It does seem to be affecting this instance more though.