Im not sure the right anyswer for this- but I was told CBO campaign do not like messing with. It's not the best for testing purposes. So if you wanna test, use an ABO campaign. Now that ABO is going away, we're going to have set them up separately and test the adsets separate like that. But was told not to play with a CBO campaign too much. Anytime, we touch it, it never seems to work as we like it to either :)