While answering a question about what a "loop" is in Map D/T Matrix, I looked at loop functionality in other grids.
The Map - Hidden Month and Map - Hidden date both suggest caches I have already found (icons have smileys on them) as caches that I should find to complete a loop (in my case check out profile "the Seagnoid", country "New Zealand", loop 8).
Please edit the loop query to exclude caches already found.
Map-D/T is working correctly.