Clarify influencer's position by number of followers and average engagement rate. If the rate is low, followers are not interested. Or, on the contrary, it is a sign of fraud if the rate is too high. (Maybe likes are fake).
A graph of each post's engagement makes it clear if there are any unnatural trends. There is a sign of fraud when the numbers are too flat, the numbers are unnaturally high for a certain period of time, or the numbers have decreasing overall trend.
Clarify the number of posts and engagement rate for each hashtag. #pr posts are advertised posts. In general, they have a lower engagement rate than overall. However, extremely low and high numbers are signs of influencer fraud or low popularity.