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When trading in items for GC missions, it shows wrong stats - in this case it doesn't show accuracy stat at all, as well as "sells for" price is different.
Also, when trading in items for GC, it never shows progress of soulbind (that can't be seen on screenshot though)
The same aetherial piece can have different stats, I assume. I've 2 aetherial feet (can't remember the name atm) and while most of the stats are the same one has critical hit rate and the other has determination (or skill speed, a different one anyway). Maybe it's a random additional stat applied on drop.