(Everpix founder here) It most certainly should unless some of the photos are not compatible with Everpix (see https://support.everpix.com/entries/20972951-What-kind-of-ph...), older than 1 year if on the Free plan, or if Facebook API doesn't return us all of them (yes, we have seen issues with the API).

Feel free to reach out to support_at_everpix.com if you think something is amiss.