Help needed on 458 Intake Butterfly's

I decided to remove my plenums to have them powdercoated and am in the process of putting everything back together. When doing so, I noticed that the 'rear' butterfly mechanism (the one that controls two of the butterfly valves) seems to stick most of the time... it doesn't always happen, but sometimes when I open it, it gets stuck on the way back and i need to 'nudge' it with my finger to get it completely closed (see pic - top is 'stuck' bottom is after I pushed it closed). Unfortunately, I do not know if this is how it was operating when I took it off... the car never had any issues, so I am thinking that this is how it was when I took it off. The front one (the single arm) snaps closed easily. Can anyone tell me if this is normal operation?
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