While wearing the starfire protocol chest and using gift of the sun while you have fusion grenades equipped the result should give you three grenades but only give you two
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I had hoped for 3 grenades as well, but if you are familiar with any of the gear, none of the stats stack. If you wear 2 pieces of armor that say gives you "Extra Heavy Ammo", you do not get double extra ammo. You get the same amount whether you have one piece of armor or 3. The stats don't stack. So the chest piece isn't broken. It just isn't what we had hoped. Believe me, I hoped for a 3rd grenade as well, but was not surprised in the least when it didn't happen.