If I wear False Gods set (5 armour pieces) and I put Shooting Star on front bar, I get the +2% max magicka bonus on back bar but not on front bar, and the other way around. The +2% mag recovery bonus works correctly: I get it on the bar with Shooting Star. This problem doesn't appear with other sets.
Thanks for the feedback. I've never experienced this issue before: I can say the passive works fine on other chars with different sets, and with this mag necro using another main set. Can't do any other experiment right now because psn is offline...
Unless your running the exact same active skills on both bars, your passives can give different stats.
Then again, I have a character that gets different stats on different bars and they have very similar loadouts...
I know this, and of course, since it is a % bonus, I don't expect to see exactly the same bonus on different chars with different builds... But I can say for sure that I've never got the 2% bonus from comet on the bar on which comet was not slotted...