For Ele Shamans, the essence Conflict and Strife grants the ability Lightning Lasso. This stuns the target and does damage over 5 seconds, ticking every second. This duration can be shorter due to diminishing returns on stuns but this is not relevant on a boss fight. This duration and tickrate are, however, NOT affected by haste.
The problem is that AMR’s simulations assume that the duration and tickrate ARE affected by haste. This causes AMR to overrate the ability in simulation comparisons and as a result, the entire Conflict and Strife essence major as well.