Ok..This is a simple one.
Under Settings/Weather, after entering or changing one of the fields and hitting Save, all the numbers in all the fields go blank. Not even a zero. If you change to a different tab and go back to Weather, it's still blank.
But if you refresh the browser, or hit Cancel after hitting Save, the data comes back and you see that the changes have been saved correctly.
Really hope your product does well and you're having trouble keeping them in stock.