Camera position randomize

So, I had saved my project which is incomplete 2 days ago, everything was fine such as my buttons and background are all in the game view

Then when I want to continue today, the camera reset itself and all the object in the game view are misplaced and the camera angle is not the one I saved.

Can I know is there a setting to this problem? Did I made any mistake during setting the objects?

Note: When I simply restart the project(same day, just a few minutes later) everything is still the same, my object is still in the camera view, the camera size is the same. I just started game creating 1 month ago, does not really know in depth of UNITY.

maybe you have switched from the 2d to 3d
5138978--508664--2d-3d.png
or other aspect ratio
5138978--508667--FreeAspect.png