Does this mean my hubs aren't going to be listed in search engines?
sort by best latest
Any idea on how to fix this? Or what the criteria is?
Yes, but only for a few weeks. You would need to make substantial revisions to stop it dropping out again - and since you don't know why it was dropped in the first place, that's hard to do.
Thanks for the help! Glad to see there is hope for a few of my older hubs.