Quote Originally Posted by Suirieko View Post
It's probably intended because you reached level 50.

Whenever you reached level 50, any EXP from level 50 or lower contents have been drastically reduced, (Which includes the Ixali). This is designed to discourage players from using old contents for level 50 or higher, thus forcing them to use the Heavensward's Contents.
As stated in the bolded part, this was a deliberate change (hotfix) shortly after 3.0 launched. For a bit of perspective: consider the fact that there was a level 60 Fisher day one, because they had amassed so many HQ fish to turnin so that they could burn all 100 allowances and powerlevel straight to the end.

It's intentional for that reason.