Hi, I don’t know if it’s a problem, but the brightness range as the light hits it, it changes color (looking at the engine and wingtip inner part), it goes from blue to purple and the brightness, if compared to aircraft like the A220 or A330 appears to be a matte gloss
I think its just the paint schemes of the individual aircraft type, with different aircraft having a different finish to it, Like the comparison of a commercial airliner (a330neo) to the military aircraft finish such as the spitfire. And as @NewsDude said, the way of developing the aircraft keeps evolving over time. :)
In my first photo it is also noticeable on the wing tip, I understand that it may be a new graphics scheme for the new aircraft, but the graphics scheme we have in the last reworkeds aircraft this does not happen
Here in the FDA and Republic Airways livery it is possible to see how this affects the original coloring of the aircraft, this does not occur in real life to be something more realistic as mentioned above
Another thing I noticed is that on the wingtip of the model like the FDA this problem does not occur, while on the wingtip like the Republic Airways this happens