Maybe this is a clue, these are all items that come up with "UNDEFINED-ID" when collecting from explorers, loot or trades where storage is full.
Have asked for this to be looked at before since original Unity test server, one of the many bug reports that mysteriously vanished from the forum.
Seems like about half the items in game have missing or incorrect flags, so the game is guessing at icons or putting ridiculous placeholder ones in their place.
See also reports of icons of random generals' icons replacing kill and mercenary buffs on adventure maps.

Why are we still reporting the same bugs of 15 months ago because the previous reports have been deleted?