I'm finding this frustrating as well, especially when it comes to diseases in AK. The debuffs aren't showing up on the group window, and I have to hope with any effects going around that I spot the spell (luckily for the first boss it looks a lot like eye for an eye, and for last boss it's an obvious breath with a cast time). When I have someone clicked it's also usually near the end of their buffs.

I have however noticed that the debuff from the granite gaols (spelling) on titan do at least stay near the front of the buffs.