Bug: Trigger two skills at same time activates cooldown on other

Steps to reproduce:
1. Put two skills on your hotbar:
- One normal skill (Skill A)
- One skill with a cooldown (Skill B)
2. Press the buttons/keys for both skills
3. Observe that sometimes Skill A gets triggered but Skill B does not although Skill B's cooldown is activated.

Examples on Sorceress
Skill A: Spark
Skill B: Orb of Storms (Cooldown triggered although no Orb)

Skill A: Spark
Skill B: Frost Wall (Count decremented although no Frost Wall shows)

I have also noticed this with Cast On Freeze + Frost Bomb as an example

Cast On Freeze + Frost Bomb (socketed)
Frost Bomb (also socketed for me to cast)

When Cast On Freeze triggers the socketed Frost Bomb, my manually socketed Frost Bomb goes on cooldown