First thing, please take a minute and review the forum rules.
Some people may find your username offensive and it's against the rules.
You could've posted this in the troubleshooting thread as it only really needs one response.
which is facepalmingly stupid if it is the case. Seriously.
You could be a bit more polite with your questions. The program is in beta after all and has a long way to go before it is perfect.
so this led me to think that they automatically change to "hot" colours when they are "hot"
This is a possibility, but your catalog files should override this. Posting your catalog file or the moons would be helpful in figuring out the problem.
If your catalog file is not overriding this and you would like more realistic colors for objects you can go to SpaceEngine 0.971\textures\common and find a planet_palette file and make adjustments there.
Alternatively you can check out these threads for information and tools
I have also attached a planet_palette file that I use to this post. You can give it a try and see if it helps with the issue you are having.
In the future please use the search function, read the FAQ, and please follow the rules. I would recommend sending a private message to an administrator about your username.