What minerals are Maintenance Supply Points made of?

Complement to nuclearslurpee info, if you don't remember, you can off and on the maintenance facilities on a planet and check the planned minerals expense variations.

This is not a bug, this is how automated assignments work. The command module jobs like XO are usually considered to be lower-priority than ship commands, so when a new ship command opens up (from construction, deaths, etc.) it is likely that an officer assigned to a subcommand job like XO will be reassigned to a ship command role.

One common cause here is if you are building a large number of fighters which do NOT have the "No Officers" checkbox ticked in the class design window. Fighters tend to be built frequently and take your low-ranking officers out of subcommand positions so they can command the fighter - I usually don't let officers command fighters because of this (and because having a LCDR in charge of, like, three guys seems a little silly to me).

What minerals are Maintenance Supply Points made of?

1 MSP = 0.1 duranium + 0.1 gallicite + 0.05 uridium (0.25 total minerals)

Probably from this thread. I don't recommend that thread simply because it's not official and is therefore unsupported, but I've used the mirrors once or twice myself so it's a viable alternative.

Thank you, nuclear!
The important thing is that the resulting installation is reliable.   

Oh, he started a new one! I thought you were reposting the old one. Cheers, will read for sure.