I'll have to make a code change for this.
if you hover on inquest when wearing the 4 piece bonus, you'll see they changed it to where the target is null. It used to say the target you cast it on even though it was going to the group.
the class file is saying if the buff's target isn't the target selected in the ui, cancel and recast. With the change the target is never going to be anything but null when wearing 4+ pieces.
Thanks for pointing it out, my alt inq wouldn't have got a 4 set for some time still (damn recruits eating my alt gear!)