In out Winnebago 2018 Fuse, 23T, the camera outputs tie into a single multiplexor box which is mounted behind the TV in the front. I can swing open the TV and the multiplexor/combiner box is right there, easy to reach and work on. I don't know if it is the same in your RV.
There are 3 input connectors - one for the backup camera, one for the left turn signal camera and one for the right turn signal camera according to Rear View Safety which made the combiner. According to them if the left and right connectors are reversed you would get exactly what you are seeing, so perhaps when they prepared the RV for sale they just put the screw-on connectors in the wrong sockets.
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2020 Regency Ultra Brougham, IB model
2022 Jeep Wrangler Sport S toad
Roadmaster baseplate and tow bar
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