So in livery designer, I start with the left side of the train. On the first car, I placed a logo I made between the driver door and passenger door. When I switch to the right side, the same logo, reversed was there. As if it just shows thru the whole car. I deleted it on the left side and went to the right side again, it was gone. So I placed it on the right side between the drivwr and passenger doors first then looked on the left side. The logo was there reversed. Again, like it just shows through the train car.
Just to confirm I also have this problem. Wasn't a GWR logo was it? Randomly my custom livery also just showed up unrequested in a standard timetabled service as part of a 12 car formation with the front unit in normal blue SE livery and the back unit in custom livery.