I started one of Maleria's quests and was presented with one normal item and one that didn't show up (only the buy-button was there). Screenshot

Clicking on the link (http://subeta.net/ushop.php?act=dosearch&itemname=Manticat+Sting&type=shops) resulted in the shop search telling me that this item does not exist.

I tried finishing the quest with only the visible item and buying , but it did not work.

Using FF 42.0 (also tried with Opera 33.0 - same result) and Windows 7 (64bit)