Walnan in Butcherblock Mtns - EXP

[Onyxofshammar]

Wiki shows Walnan as a lvl 47 mob. I have camped her for hours and seen only a slight movement in my exp bar at lvl 56.

In GD recently doing frost giant elites....max lvl 45 and over the same period of time, my exp bar can be seen to move. BB has a higher listed ZEM value than GD does, so doesn't make sense.

Can certain mobs like Walnan have their exp award modified ? Both the frost giant elites and Walnan con blue to me.

Thanks for any insight.