Altitude problem

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Good morning,
I've been working with the Phantom 4 pro for several months and it's been great. The first model of a specific site worked out very well. A week later, I did a second flight. When I downloaded the photo's, the altitude reading was negative. When I created the model, the surface ended up being 200' below my GCP's.
Any suggestions?
Any help would be appreciated.
I used Drone Deploy for the grid setup and Agisoft Pro for my processing.
Thank you.
 
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