Items such as Exsanguinous, Last steps of the living as well as passives such as the Lich’s ‘Mind Over Body’ that drain %hp per second are creating a current hp cap that is slightly below max hp. While not a major issue in itself, it is preventing leech instances from falling off from when a player his 100% hp.
Video below of my SD rogue (5% leech, ~100% leech rate):
