This may not be 100% applicable as I’m not understanding the issues you are experiencing 100%…

But here is a reply from Alby support which may have some application to you.

“Just make sure you only have one Alby account in the browser extension with your correct nsec keys. If you have multiple accounts, they all need to have the same nsec keys. You can either remove the duplicate extension accounts and keep the one with the original nsec keys, or copy the original nsec keys to the other extension accounts. It’s up to you. This is necessary because we don’t store nsec keys on our servers: they're managed only in the extension. Users with multiple extension accounts but a single nostr profile often face this issue.

Right now, there’s no workaround for this regarding nostr keys, but we're considering future updates to possibly manage nsec keys within Alby Hubs for a smoother experience. However, this isn't under development yet, and we're still exploring how to implement it.”