Additional level are created unknowingly

Hello, sometimes hen i save my file, it asks me to save…additional levels that I did not intentionally create. I have no idea how they come about. I simply use File → Save All. Most of the time it just saves, but some times it prompts a Save Level As and Im forced to save a new level. Any idea what im doing to trigger this? I only want one Level for now.
UE 5.0.3

Maybe you have set your project to open on a blank level when you start it. Then you proceed to open another level, that would prompt to save the level you were just working on.
If you are using some packs from the Marketplace, they are built using multiple levels. That might also be the reason.

To to window > Levels and see if there’s more then the persistent level there, if yes, those are the levels that are being saved.