Customize the value of Big Nudge (8 or other values). After a period of normal use, Big Nudge will automatically change back to 10.
To report a bug, please reach out to Figma support team via support@figma.com or the support request form.
This should be fixed now. Is it resetting after a specific period of time? This value is stored in your local storage so whenever that gets cleared out the setting would also reset