Bulk Trade Weirdness

I've been trying to purchase bulk T16.5 maps and the sellers who message back state that the maps they're selling are corrupted and they've received numerous trade requests looking for normal maps.

This was done via the Bulk Item Exchange section of the trade website. I double-checked my search criteria and there's nothing there stating to search for corrupted or otherwise.

One of the sellers stated that only the corrupted maps were for sale.

Is the trade website not pulling materials from the map tab?