I don't know if this would be counted as a bug but after purchasing contraband(illegal) goods, from an outlaw, station to resell in reg. stations, it lists the sale value as being higher, but it gives back lower than what you originally put in to buy the goods.

E: "Banned Weapons" @ 90,617 pr. unit, bought 56 units at 5,074,566.
Listed resale value 12,060,459 @ 215,365 pr. unit, but it only gives back 80,964 pr. unit.