It seems lemm.ee is missing data that is available in other instances like lemmy.world. Even posts and comments made on lemm.ee itself.
For example, compare the profiles of @[email protected] on both sites. You’ll notice that on lemmy.world there are more comments more recently.
https://lemmy.world/u/[email protected]
Edit: as soon as I posted this the data seems to have synced back up again.
I too have noticed this over the last few days…not sure if the data sync is just slow or or if it just never makes it. Haven’t tested it out yet.