Deidbell Elite Greathelm life cost bug with Urgent Call node

Wearing a Black Sun Crest Wrapped Greathelm, my warcry life cost with blood magic and Urgent Call spec'd is 28 life per cast with 5374 life. If I equip the Deidbell, my life cost turns into 100 life per cast with 5088 life. There is nothing that should increasing the life per cast by 3.5x. Sometimes a regular Deidbell life cost is 30~, and with another Deidbell sometimes it is 100. There isn't anything indicating what is causing this increases life cost.