Ability CD Triggers, Ability Does Not Fire

[Shraen]

Heya.

I've been experiencing similiar or the same issue as person above me.

What is happening?
TL;DR version: Sometimes using skill triggers cooldown/global-cooldown and that skill does nothing

Long version:
I've been experiencing a strange thing happening when you use skills in rapid succesion. As a monk I have a lot of OFF-global-cooldown skills (DPS buffs, stuns and other cross class skills). Sometimes when I try to use that skill after previous normal skill(which triggers global cooldown) that skill goes on cooldown without any effect.
I noticed that following skills are affected:

1. Mercy stroke - lvl 26 marauder skill - 'execute'/damage skill
2. Perfect Balance - lvl 50 Monk skill - self buff
3. Blood for blood - lvl 34 lancer skill - self buff

At first I thought I may be missing the skill (due to low accuracy), but when this happened to self buffs i thought it may be a bug (or self buffs can be missed when used? xD)

My hypothesis:
Something is not right somewhere between using normal skill, its animation ending and triggering off-gcd skill.
High latency may be causing this too..