Abilities buttons disappear after zoning or dieing

[sk8jack]

Hi guys, I'm in need of some help here. Whenever I zone or die, my abilities which I've put onto my buttons bar disappears. Skills such as Sense Heading, Bind Wound etc.
There still seems to be buttons on the bar after zoning or dieing however those buttons which were previously the abilities buttons does nothing when clicked (there's no ability name on them after I zone or die).
I've tried changing to another UI but the problem still persist.
Appreciate if someone is able to solve this issue. Thanks!