How many scenes do you have in the project?
Are you using an external layer?
If you save your project with the extra wall sprite, close GDevelop editor and open the project again, does it still have the same issue?
Lock = Locked in the editor (can’t move by clicking/dragging nor arrow keys). Can still be clicked
Crossed circle = Locked in the editor and cannot be clicked at all. Can only be interacted with again via the instance list.
As far as the above posts, this almost seems like multiple object instances got selected then dragged while ctrl was held down. This duplicates all selected items. If they got dropped before being moved, there’d be duplicates of all of them ontop of each other.
For the rest of the issue, I cannot provide any guidance, but as Keith mentioned you’ll probably need to show your events for this scene for folks to better assist.
I don’t think they’re overlapped. One set has low coordinates and the other high. The second set might he off the screen. IDK how large the scene is. The objects seem to be only 16 px apart from each other. Try zooming out in the editor.
Edit: it is possible that you’re editing one set and then the camera changes to the other set with the center camera action. With multiple player objects, the camera action would pick the first instance.
Even if you have 2 sets of objects, I don’t thinks that’s your problem. IDK why the object is disappearing. I don’t see any actions that would be responsible.
Changing the zoom in the editor would be the easiest way to check for excess objects. You can use the scroll wheel, keyboard or the menu.
Some of the objects are locked. Others are locked and set to present then from being picked. You might have to use the instance panel to select them.