Soulbound 'bug'?
The interesting part about salvage kits is that I had a few starting characters with salvage kits. I stored them to bank and deleted the characters and those salvage kits are not transferrable. It said they are account bound but didn’t actually allow any of my characters to remove them from bank, so I ended up deleting them.
I tested with existing characters and I could transfer the salvage kits between characters. Though I’m not sure if this is actually caused by character deletion or if those salvage kits were so old (a few days old) that something had changed in the binding mechanism.
Kinda weird on the salvage kits. I just checked and all mine are transferable. I’m betting since you deleted a character, it screwed with the item status. Another bug.