@deluxxxe 

Just looking at this screenshot all I can say is that its due to the permissions on deluxxe. Currently they have only read access, so while you will be able to view files on the share drive you won't be able to add or remove files.  The other profile deluxxe2 has both read and write.  You can click the modify button next to deluxxe to change the permissions.  As to why a new profile suddenly appeared that would require troubleshooting.  Its not something that should happen without direct access to the router's UI.

  @deluxxxe 

TP-Link routers have two possible login options.  1. The local credentials and 2. A TP-Link ID.  The TP-Link ID is only availabe if the router is bound to that cloud account.   The only time access is restricted is when you have specific devices designated as Management devices, If your PC was not one of them then you would have denied access at login. 

For the credentials cocnern.  I see where we might be confused.  I assumed the Deluxxe and Deluxxe2 were the drive names.  But those are actually the credentials.  There are two sets of credentials, one that gives full access to read and write to the drive and the other is just read.  This way if you allow others to access the drive you can give them specific instructions to limied what thay can do on your drive share.