[Tilesathome] Rendered tiles vanishing

[David Earl]

Last week (Friday?) I did tile requests via informationfreeway on tiles
   2046,1348
   2046,1349(*)
   2047,1348
   2047,1349
   2048,1348
   2048,1349(*)

These never appeared on the map.

At some point over the weekend I requested them again. Still nothing.

After some substantial work on the area today, I put the same requests 
again and watched the queue while they went through. They've now all 
dropped off the bottom having supposedly been rendered, but only two of 
them have appeared on the map (both are today's data, not the ones from 
last week).

How can I find out where the other four have gone, and why did the 
earlier ones get lost altogether, all 6 x 2 tiles?

David