Instance publishes my user "partly". My user is found but w/o profile image / banner
I have a question relating my single user Pleroma installation. I first installed it using a subdomain (sub.domain.com). Everything worked nearly out of the box.
After using it for a while successfully I thought that subdomain was not very well chosen, so I tried to change it (sub2.domain.com). That was when things startet to get corrupted it seems.. For that I simply changed domain in prod.secret.exs (not changing any other settings like keys and stuff). Result was, that my user was found on other instances with posts and profile text, but profile image / banner is not set on other instances (although set on mine of course). On a friendica instance the user is not even found (it was in first try).
I removed my installation completely and started installation from scratch again on the TLD (domain.com), but the problem remains. Although I did install everything exactly the same way as on my first try, my user is still w/o avatar image. People can follow me and see my posts, I can follow them etc. But the instance seems to be connected "partly" only.
I have no idea where to search for that problem. Why can other instances see my profile text and my posts and everything but not my profile image / banner? Do you have any hints where to look into?