[2020] The accumulation of Protection stacks won by Contempt node (Leech Life) seems buggy

You can only gain 1 stack of Contempt from each enemy. You’d have to be channeling on 6 enemies to get 6 stacks of contempt. Each stack you’ve acquired will persist for 2 seconds per point in Enduring Contempt, but you can’t pause or refresh the duration of those older stacks by restarting your channel, you can only acquire new stacks.

Are you getting 3 stacks of Contempt from a single enemy?