Were you using the Related Data button for these checks? Related Data – Events or Samples will filter the observation hierarchy for survey events or samples where the selected person is listed as a recorder. Related Data – Occurrences filters for taxon occurrences where the selected person is a determiner on one of the determinations listed on the Dets. tab. If observations are entered with a determiner who is not one of the recorders, the recorders go on the survey events and samples but not the taxon determinations; the determiner goes on the taxon determination. Thus using Related Data – Occurrences for one of the recorders in this situation would not return the observations entered (technically correct, if not particularly obvious).

I have used Related Data - Occurrences and had assumed that I was getting the occurrences that had been recorded by the person rather than their determinations. Most cases in our system it would be the same, so not a major problem. I can see now why this would have made sense, but it is a bit counter-intuitive.