I've been having this alot with buying things from vendors and replicator, usually the commodity above or below is purchased and not the one that's actually selected.
WORST of all. Today I was the embassy, and wanted to purchase a Romulan Tactical Officer (Rare)
Ended up with a Romulan Science Officer (Rare)... 80,000 fleet credits and 20k dilithium down the drain.. I'm really unhappy about this. I doubt this will be rectified or that I can actually swap it with the one I actually wanted to begin with,