Lately I fully optimized my Classified Striker Backpack, at the Optimization Station, it says 'the item is fully optimized'.
However the gearscore of the Backpack is only 289,
Armor attribute:1334+80(cap)
Firearms: 1401
Stability: 17.5%
Ammo Capacity: 56%

My other Classified Striker pieces some are not fully optimized, but the gearscore is like 290+

Is this a known bug please? Thank you.