"Place graphic" shows through to inside

I exported my .dae file and converted it using Strata and then Photoshop to an .obj which I then imported into Dimension.

The carton is fine until I apply my graphic. For some reason the outside graphic shows through on the inside.

Also, is there a way to apply a graphic to the inside panel? This particular carton has different graphics inside and outside on the same panel.

Any suggestions?