When you re-run the Camera Alignment process, are you making sure to re-run the target marker engraving each time, and not to re-use a previous engraving? That’s crucial.
Here are some additional resources on the camera alignment process. Please review them to make sure you’re completing the alignment properly:
Try rerunning the alignment process, taking care to be as precise as possible when marking the targets. You can also try upscaling the size of the target engraving; increasing the distance between the targets can improve alignment.
Finally, if you are still off a bit, you can use these numbers in the Camera Control window to fine tune the placement and scale:
The ‘Shift’ values move the background image around, and the ‘Width’ & ‘Height’ values adjust the size. When you have it aligned, click ‘Save’ so the values persist.