Materials refusing to stack in my bank.

Narvuntien

For some reason, the materials I got from the special event box you get for free from the store do not stack in my bank with my other upgrade materials taking up extra slots in my bank.
I have 104 and 4 grain solvent and 131 and 4 elegant lining and 68 and 4 zirconium plating and they will not stack. I don't have the bank space to store them seperately.

Dangranma_Burgrukgad

Not a bug, they have set as bound all the rewards from the box withouth really thinking of the implications.
https://forums.elderscrollsonline.com/en/discussion/619453/event-rewards-can-someone-explains-this-to-me#latest

Narvuntien

Is there any way I can use them? specifically over any other materials, I might have. so I can't sell them if they are bound.

Just destroy them?