10% of Infernal Flame lost per second if none was gained in the past 2 seconds

Infernalist’s Pyromantic Pact describes that 10% of Infernal Flame is lost per second if no Infernal Flame has been gained in the past 2 seconds. However, this description does not match the actual behavior, where 10% of Infernal Flame is lost every second regardless of whether it has been gained in the past 2 seconds.