Here is the command I use to set up the export:

/file/transient-export/ascii result_file () x-velocity y-velocity pressure phase-water-vof () no no export1 time-step 10 time-step

How would I check the export limitations? Also for post-processing I am just using a script that I wrote. I don't think there are duplicate points being exported because the number of nodes written out matches the number of nodes in my mesh.