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I think I remember someone saying this was a UI bug.
NA | PC | Aldmeri Dominion
Laser Eyes AR 26 Arcanist |Stalker V AR 41 Warden |I Stalker I AR 42 NB |Stalkersaurus AR 31 Templar |Stalker Ill AR 31 Sorc |Nigel the Great of Blackwater
From what i can tell the visual effect as well as the ui icon will stack on the target but the actuall debuff will not stack, though if one of the debuffs duration expiers the others will then kick in. Buffs on one self or allies work the same way.