Zskera Vault Keys very rarely dropping

I spent a couple hours killing rares as a Guardian Druid in War Mode yesterday and only got 3 out of 12 rares to drop Vault Keys…the rest kept dropping Storm Sigils which will do NOTHING for me as I primarily only run PVP. Vault Keys can help ANYONE in the game but Storm Sigils ONLY help those that do PVE content. Maybe this is a glitch? Maybe it’s a new drop rate that was changed so we get less keys now? Maybe it’s just my bad luck? Which ever the answer is, it is WAY different than the drop rate a week ago.