You are probably using the same design on all 3. Try “Save to Design Catalog only”. Give each color scheme a different name. Also the thumbnail sometimes doesn’t correctly update. So load the design and double check. If the design is right and the thumbnail is not, load it, apply and remove a sticker and “save to design catalog only.” Then load the file. It should be right.
No I only saved the grey one then when I load the grey design onto my car I then go change the color of the decals to white. Then I save the new color as CTS W I go into my garage and see a grey a blue and a white. When I select my grey one to go drive it suddenly it is white too. I go to reload the grey one which is saved as CTS G and it loads onto the car just fine, but when I go back to my white one. BAM suddenly it’s grey again.
Had this prob myself. Save 'em to design catalog as caddy1, caddy2, caddy3. Otherwise they’re all called “forza livery”, and you’re actually saving over the original every time you swap up the colours on any of 'em.