Your model is looking great in RealityCapture, but in your 3D Application - it does not. This tutorial shows you how to improve the quality of your 3D model within RealityCapture.
https://dev.epicgames.com/community/learning/tutorials/Xe4Y/capturing-reality-my-model-looks-great-in-realitycapture-but-bad-in-my-3d-program