To Bungie,
The "sticky" grenades in destiny have been "falling" off of the enemies in both PvE and PvP. While watching one of Mr. Fruit's new videos I notice the same thing happened to him. The magnetic grenade is the worst "sticky" grenade to which is irritating because the Titan is my main class and I don't want to have to use my warlock to have a grenade that actually sticks most of the time.
From, The New Monarch ULTRALORD20
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It's probably a lag thing. I've seen my grenades chase a guardian before like a curveball lol they're plenty sticky.