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Poor results with one particular mission (DJI RTK)

This project was flown with a DJI Phantom 4 RTK with the D-RTK 2 base station and a surveyor provided us with the GCPs.

I have flown 12 different missions to cover a large project area (735 ac.) and am having issues with one particular area. I’ve flown the mission 3 different times with the latest one using maximum overlap and sidelap (first two missions generated about 1150 photos and the last one was 3377). I also increased the GCPs from 13 to 24 in order to improve my results.

Here are the results from the first flight:
PCR Mission 4_report.pdf (319.8 KB)
Here is the second flight:
Mission 4 Reflight_report.pdf (389.4 KB)
And this is the latest flight:
Mission 4 V3_report.pdf (424.9 KB)

Here is an example of the DSM from this last flight:

…compared to a neighboring mission:

I don’t understand why this particular area keeps giving me the same or similar results as opposed to the other areas of the project that were fine.

I appreciate any help.

Thank you.