Thank you for your reply Kelmych (also for your Clear and Present Danger guide, which is the one I am following). Yes, it is the same for other records, at least for all the Navmeshes listed in the video for both The Pitt and Broken Steel. The other navmeshes (the non-deleted ones) seem to be okay, although at this point I could be missing information and not know it. And yes, I did make the changes to the options, including the ones on the expert tab.
I have also overwritten the ESM's with vanilla backups I made, in case I did something wrong, re-installed xEdit, and deleted xEdit's overwrite files in MO. I've also tried opening xEdit on its own (not through MO) and get the same result. I am a little lost, to be honest. Thank you again for your help.
Here is what it looks like when I click on a navmesh not mentioned in the video.
Broken Steel - Navmesh.jpg 96.8KB