Forum:Super rare glitch

It was my 3rd time farming the armory with my lvl 61 soldier yesturday and some weird happened. I got to the lance depot section and went to the 3 red chests that are right next to each other behind one of the lancers. I opened the first one and got a hellfire. Then I opened the one in the middle and it made the same sound sequence as opening a lance chest. it opened and it had two snipers and two shot guns on the lid of the red chest. Is this a rare glitch where red chests turn into lance chests or what?