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I would try enabling VSync if it's not already on. Also try disabling other programs or settings that can do in-game overlays. Like the steam overlay, etc.
Other than that, the only thing that comes to mind is the mouse needing cleaning or the button is going bad. While you said it works fine outside of Kenshi, did you test right click and holding specifically? I would go to the desktop and try doing selection boxes while holding right click, if the mouse is having issues they would sometimes drop despite you not releasing the button, and would explain the issues you're experiencing.
https://steamcommunity.com/app/233860/discussions/0/1640912849410333220/
At least the issue has been identified, so it can be dealt with. :)