I think it's been like this for a few months. Here is a short list (items include their upgraded counterparts) of the ones I've noticed:
Legacy
Excalibur
Durendal
Valsgarde Helmet
Heavy Bear Hood
Studded Gauntlets
Resurrection Tome
Also:
Swadian Great Helmet
Steel Gauntlets
Bronze Bolts
Pikeman's Heavy Plated Vest
Hornskull
Helmet with Leather
Bear Hood
Cursed Elegy, Deployable Board Shield (3)
Cursed Ullr's Bane
Bloody Blindfold
Ghastly Hood
Cursed Studded Gauntlets
Battle Honed Swadia's Wrath
Blessed Durendal
Elegy
Side Sword
Training Shield
Claymore
Normal Grindstone
Mystic Charm
It's not even been a month, I reported it on 20th of December. I think it happened on christmas update, half of pictures seems to be missing indeed.
There were others missing before, which came back as others were lost.
This seems resolved. Thanks!