[1.7.3-1.10.1] Bluedog Design Bureau - Stockalike Saturn, Apollo, and more! (v1.6.3 "титан" HOTFIX 2/Aug/2020)

That's what I was afraid of. If you say everything should be ok on your side, then it must be a side-effect from Realism Overhaul. I don't know yet how the differents mods interact, but it seems the RO mod prevent some of your parts to be scalable. I'm going to search. Thanks