Export to JSON or CSV includes a fraction of my total list

I am trying to export my vault but it only produces a file with about 5% of all my records.Oddly, all the records are complete (i.e. it is not a truncated file issue). I am trying to find a way to export a subset of my records to see if I can identify which record is causing the issue but I cannot seem to get it to work. I exported complete lists previously but not any more.