It's because of how the compression of Ironman saves works on Linux. It will cause high values to overflow and make them negative when you load the game. It shouldn't be an issue on Windows though, as the compression works differently. Unfortunately, this wasn't actually reported until quite recently.
We are aware of the issue, however, and have a report of it in our bug database.
We are aware of the issue, however, and have a report of it in our bug database.
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