When using these powers, sometimes the cooldown timer displayed will be much shorter than what the power's actual cooldown is.
Upon clicking these powers again when they apparently come off cooldown (or by using a cooldown manipulation power like Nanobot Swarm) the game properly updates and shows the actual remaining cooldown.
I suspect that these 2 powers are targetting themselves when applying the "30/90 seconds shared cooldown on other AO/ADs". Visually the timers display the "shared cooldown" timers but in reality the powers go into their actual cooldown (90 second for Ice Barrier and 2 minutes and 30 seconds for Master of Mind)
Kaiser Behemoth, Ethereal Queen, Fenrir, Galen, Fujin, Madeen