My total changes automatically but the FB rating takes time. Is it possible you are getting alot of people that have purchased from you before so they are NOT unique buyers and theregfore dont count towards making a change to your rating?
As an example, out of 29 positives given to you today. 3 Buyers accounted for about 25 of the positives. If they never bought before, their FB would only account for 3 unique positives towards your total FB.
Malcolm