If you're referring to the "Shipboard" tab, I'm aware of that. I seem to be suffering from some kind of bug where I either have no engy missions there or 5 versions of diagnostics on the weapons systems.
I've discovered that if I open the DOff window on the ground AT ALL before clicking on the shipboard tab after logging in, the system will assume that I'm on the ground and not show me any engy missions because those are keyed to being on the ship.
Still doesn't explain why Reverse Engineer missions are Exploration CXP not Engy...
Most of the time it tells me I have no shipboard missions. Hard to do Engineering missions when they are Shipboard missions and you have none for hours at a time.
Workaround: Never click that page when you're on the ground. Some shipboard assignments are available on the ground, but most require you to be in your ship. But there's a bug somewhere.
From what Heretic's said, it's supposed to work this way: If you beam to your ship, the shipboard assignments you can't see should be there.
How it's actually working: Each reset, the first place you look at your shipboard assignments locks them in until the next reset. If that's in space, assignments that are supposed to be ship only will still show up on the ground, and if you're on the ground... I hope you like treatment for minor injuries and colony applications because the ship only ones will be unavailable until the next reset.