My newly upgraded bolter keeps downgrading itself

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Issue Description:
Created a purple bolter from a blue one, but when i switch to it, and then re-open my inventory, it is shown as blue and with its old stats. I can re-equip the gun and it will switch back to purple, but until i re-open the inventory again

Steps to Reproduce:
Get blue bolter. Make it purple. Equip it. Close inventory. Re-open inventory. Bolters now blue again. I have no idea if this is how it is for all weapons, or if i just got the special case.