The lastest notes seem to be only on relay.nostr.band. make sure that is active for the Home icon on the general relay list.
Discussion
It appears to be a Mastodon account bridged to Nostr. I figured the notes would at least be on relay.mostr.pub. Doesn't appear to be the case.
Thanks for your Answer. I installed #coracle now and there I can read the notes of the account without problems. I am only reading from the nos.lol relay. So to me it seems an app issue.
I always see this on Amethyst. It seems as if the app has the relays, to download all notes. But has some kind of display issue.