Probably you restarted the project using a different database. In the Project->Setting, did you switch to another configuration and then restart the project?

Or another easy way to ge to a different database: did you click “Run” instead of “Run locally” and after then clicking “View” end up in the cloud version instead of the locally running version?

If it is not already the case you should check in the manage user if everything is correct, active attribute, blocked attribute etc...