My active and closed auctions always show N/A and it probably means Not Available and here's the reason (at least for me).
I don't use the Sellethon counter in my auctions (I use Andale-Vendio counters), so I'm guessing that coincides with not having that counter in your auction, i.e. the Auctiva hits count is for the Sellethon counter and no Selethon counter translates to Not Available under the Hits column.
Hope that analysis makes sense and is correct.
Danno