Hey natnat3141,
sorry you are having issues with the game. We are currently not aware of any mac issues on Steam (we had crashing issues on windows though, which was fixable via deleting specific files: https://steamcommunity.com/app/1369320/discussions/0/3104642254789738591/ )
We currently can not reproduce the issue you are reporting, so it's hard for us to find a solution in your case right now. We'll continue looking and poke some ppl we know, so maybe they can help us find a way.
Sorry for the inconvenience.