Eternum Nocturne Skin on Loot Page bug (Can't upgrade to perm)

There seems to be a bug on upgrading Eternum Nocturne skin to perm. I can upgrade everything else in my loot page, but not Eternum Nocturne. The skin cost 1520 orange shards to make it permanent, but I already have 3870 shards. Everything else works but the upgrade button won't work on that skin alone. It is very strange...