I think I know what this is which is funny as it's an old bug that can be exploited for advantage. Send a PM if you want more Info. I spoke to Jack (and at the time Andrew) about this roughly 4-6 years ago..
Hi David! Welcome back to the game, you've been playing it longer than I have!
Could you e-mail support@igpgames.com to talk with me more on how this could be exploited? This way I can get it in front of Jack and our devs to address this.