The Followers field in Funnel's Instagram Insights connector has gotten more accurate. This is a result of our updating the connector to use API-version 9.
According to Facebook/Instagram, this update means the metric is reported with better precision. At the same time, Facebook is limiting the amount of historical data available to 30 days.
In this article you can read Facebook's own statement (see follower_count under Metrics and periods).
Click here to see what fields and metrics are available in our Instagram Insights connector.