I had a Hammer of Memoryforged Desolation drop today in the new zones and after I went to equip it, the item changed to a tier 1 weapon of Club of Fiery Revelation.
Just to get the question out of the way, did you accidentally activate your bandoleer to equip your Club of Fiery Revelation? Or did you never have that weapon before? Either way, you can try a find in your inventory window for memoryforged to see if it's somewhere in your bags.
I had the chase loot, and physically placed it in my hand... the attune question box popped up, i clicked yes, weapon went into secondary. still have velium threaded as my 1 hand blunt in bandolier, did not change that. Now it has returned.