Check the plastic retaining ring inside that holds the lower burr in place. Mine broke, but they’re cheap and easy to replace.
https://www.baratza.com/en-us/product/ring-burr-holder-sp0101174?sku=SP0101174
Or if you have an ESP: https://www.baratza.com/product/ring-burr-holder-for-encore-esp-sp0102053
The Polynesian people had many ways of detecting land far beyond the horizon using ocean currents, temperatures, weather patterns, animal movements, and others which they used to island hop all the way through the Pacific Islands.
I have little doubt it was a well informed theory before they got into their vessels.