Shadow chest item bug

To start of I ABSOLUTELY love this game, I own it on xBox with max weapons and armor. Anyway, I was looking through the underworld when I went down to a shadow chest an opened it. I looked inside and saw a Drax, in PRE-HARDMODE, SHADOW CHEST, and I due to my experience I knew something was wrong. I found the normal items in a shadow chest but no exclusive weapons from a shadow chest. I havent seen this on YouTube or anywhere else, so maybe its a bug or a rare 0.01 chance to find, anyway I have a picture proof. Thank you for reading this.

Scp Security Guard about Terraria, v1.2.12785