Our fleet has had the problem for some weeks,Bug reports have been filed but so far no action has been taken. I think the difficulty is that not all Fleets are effected so it is proving hard to identify the glitch.
We have the same problem. We now have level 2 starbase and about to start on tier 3 and can only buy the base +1 boosts, even though we have a rediculous amount of provisions. Other players are running around with the higher boosts, but our fleet cannot buy them. This is only on our FED fleet, KDF fleet is okay.