In mid-April, Instagram officially deprecated several post-level metrics and stopped supporting them through their API. Because of this, Measure Studio also sunsetted support for those metrics. You may see negative values because these metrics no longer update.
The metrics are still available in Measure Studio for historical reference only, and are clearly marked as Deprecated. To track post performance moving forward, we recommend using the Views metric, which became available on April 18. Instagram backfilled this data all at once, so we suggest filtering from April 19 onward to avoid the one-day spike.
For a full FAQ and the list of deprecated metrics, check out this article.