If my understanding is correct, only 19 images out of the 36 of your projects were synchronized with your mobile device. Then I assume that except this fact, the mission you planned was achieved properly.
A section is describing how to synchronize pictures with your drone. Note that by default the automatic synchronization is activated. If something went wrong and that you can not synchronize the pictures taken by the drone with the mobile device, you can get them straight from the SD card.
If you can not get the pictures in one of those ways, then something went probably wrong with the mission.