have you checked them to see what they're actually running at?
Typically they will go off if you go under about 30psi, or I believe if the computer sees a large disparity between one and the others.
Check them yourself, including your spare, just to make sure that everything really is good to go. Give it a day or so of driving, if it hasn't reset, then take it back to the mothership.
Make a man a fire and you keep him warm for a day....Set a man on fire and you keep him warm for the rest of his life....