No Refund for Canceling Reinforcement Bug
When you reinforce ships in port, the reinforcement/repair takes only 1 turn. When you reinforce land units, the reinforcement takes 2-3 turns. When you first cue up reinforcements for land units, money gets withdrawn from your treasury. If you cancel those reinforcements in that turn, you get your money back. However, if you cancel the reinforcements in the next turn, before the unit has actually been reinforced, you do not get your money back.