Assets from one map appearing in other maps

Im making a small project for uni and for some reason objects in one map appear in the starting map in editor, when I delete the objects in editor they delete in other map, how would I go about fixing this issue

If you delete an asset(mesh, texture, material,etc…) from content browser they will be deleted in all maps they are in. You can delete actors (objects) on a map(level) that are made of this assets (which you should not delete from the content browser(unless you are never going to use them)).

I wasnt deleting them from the content browser, forgot to upload video of showing what I mean, but the video shows clearly what I mean

Looks like you have some level streaming or something like that going on.

Yeah that was it, thanks