There you can find some basic information about flight logs:
https://rchelp.capturingreality.com/en-US/tools/flightlogimport.htm
Basically, you need to conver the MRK file to CSV or TXT file, where will be these columns:
Image_Name Latitude/X Longitude/Y Ellh/Z AccX AccY AccZ
And then import it into RealityCapture using the proper coordinate system.
So, 1 line could look like:
000001.JPG 42.0414215488 12.24007771574 315.712 0.012195 0.015831 0.0339373
It shouldn’t be a reason for such result. Bigger influence had flighting not a dobble-grid mission and capturing only from one flight height.