Our google rating doesn't match the average of our reviews

Pretty common. A few reasons it can drift: - reviews that Google filtered or removed (spam detection, deleted accounts) can drop out of the score at a different time to when they disappear from the list, or the other way round - the score is shown rounded to one decimal - the list you're adding up yourself may not be every review the score uses Google doesn't publish exactly how it calculates the number. If the gap is small, I'd leave it. If it's big and sudden, check whether a batch of reviews vanished recently.