Got a duplicate from Warlords Mystery Box

Hello. I opened my warlords mystery box from the vault pass, and I got a broken sword pet. However, I already have one. I talked to some people about this, and they all agreed that this was strange, and they thought it was a bug. So I was just wondering if this was intended, and I was just really, really unlucky, or if I encountered a bug. Thank you for taking time out of your day to help me! Have a good day.

This has been resolved