New post in the Announcements Forum:

We in process of building a patch that should correct the “unknown item” issue showing in some player’s inventory. The unknown items are quest items that have been disassociated or unlinked erroneously.

Once the patch is in place these items are expected to be correctly listed as yellow in the quest items list.

This patch is expected to be ready around 4am CT
https://www.shroudoftheavatar.com/forum/index.php?threads/live-server-patch-unknown-items.174343/