Getting an odd number of credits on a double credits weekend?

[xxdeathknight72x (Inbound Titan - Killing you with SCIENCE!!!!!)]

Anything multiplied by 2 is always an even number right? How am i getting 331 nd 573 credits?

[WinterschneeFee (Jessica Noire)]

My guess? Decimals, unseen by the player’s eyes. I haven’t played the game but I would assume the game normally rounds up/down but in this case after the doubling already happened, leading to odd numbers.