Hi Trent, the most likely cause is that you don’t have a defined coordinate system and every project is calculated in an arbitrary coordinate system. It has a different scale, different rotation, etc, even when the object appears in the center of the grid.
The best way would be to define a local coordinate system with a few coded markers for your rig. If your rig is solid and the cameras don’t move, you can reuse the existing camera poses as priors for the next calculations. This will preserve the local coordinate system. In this case, the reconstruction region will always be placed in the same position.
You can read more about this workflow in this tutorial Coordinate System Preservation Using XMPs or GCPs
Let me know if this helps.
Cheers!