We perform both follow and unfollow activity every day, which is likely why you’re seeing a lower net change in your total following number.
For example, if we perform 100 follow actions and 50 unfollow actions, the net change in followings would be less than 50. It should be 50, but it’s less than that because following private accounts does not increase your following number until the request is accepted by the user. We have been focusing on follow actions since starting your warm-up, which means that every day we perform more ‘follow’ actions than ‘unfollow’ actions.