Hi @evgils
Looking at your first example for this match result that should have ZCP_EWD_1632 as a match candidate, it looks like there’s no location ID on this encounter, only the country. Match candidates are determined by the taxonomy, viewpoint, and location ID. If you choose Zambia as your location ID when you edit the encounter and then restart your match, you should see an improvement in your match results.
I spot-checked other encounters in this import and none of those have the location ID, either. My recommendation is to update your spreadsheet to fill in the Encounter.locationID field, delete this import and upload it again with your corrected spreadsheet.
This does not appear to be related to the MiewID issue reported in Whiskerbook as I wasn’t able to replicate the same issue in ACW. All testing I’ve done has returned the correct match candidates.