Rival IQ reports only organic engagements (not organic + paid) for Instagram posts.

You might have noticed that some Instagram posts have a lower engagement compared to its corresponding post on Instagram.com. For example, this post from our Instagram Insights section reports 32 likes

but the actual Instagram post on Instagram.com reports 35 likes.

Unfortunately, we cannot report organic + paid engagement because we receive only organic engagement from Facebook's API (Instagram Insights data comes from here).