My problem is that I can't use "Nostr market" because "Nostr client" I don't have permission to use it...
I've tried using Marketplace extension, but I don't like how it handles images and it doesn't integrate directly with Nostr.
Discussion
You should run lnbits yourself if you want to control the client extension. The Nostrclient extension can only be managed by the admin of the server as they can decide what relays the extension should connect to. Your shop seems to work fine for me
After writing to you I tried the Nostrmarket again and even without the Nostrclient extension it seems to work: