I think using the default Ubu repositories for RT (or DT, for that matter) is seldom a good idea. Just like with many apps, they tend to be very outdated. Now I go straight for the latest stable RT AppImage and voilà.
They look really different in those screenshots to me 
The Teinte being at less than 0.6, in particular, seems weird and may be a major factor causing the weird color, I suppose.
By the way, when [Questions] How to choose a DCP profile (if at all) got sidetracked about a white balance bug, I did a embedded-jpg-vs-raw comparison and I got the impression that JPGs could not be trusted in that regard. I mean, they seem to yield very different temperature and tint in RT than their raw counterpart, even when the camera data is read properly. So beware. I may be wrong, though; I’m no expert. Just empirical observations from the other day.
Oh and perhaps the workaround I currently use for my camera would work for you as well: try to see if ART (or any other app, actually) is able to read the missing info better. Then if it looks good enough you can just steal its temperature and tint and write them in RT.