uid 1462105 / pp23037712 / The Pirate Bay / segment00

I've noticed when I make a purchase of the maximum number units for a given ship in the Shipyard (or the Armory, which I used to cross-test), that the screen redraws and displays 1 unit is available for purchase, even though I am short of a necessary resource. The screenshots below show that I do not have enough timber, but still list a unit as being available. I DO get the original quantity of units that I want to buy. The bug is intermittent.