Delayed damage with The Lob?

Since the new buff, I had to get the lob out of my bank and give it a try myself. It does shred enemies, but sometimes the orbs will pass right through an enemy, dealing no damage and giving no hit markers, then a few seconds later I'll watch their health disappear and they'd die, only then will I get the hit markers. On at least one occasion, the orbs never even gave the delayed damage, and the enemy's shield began regenerating. Is this some kind of feature of the gun, or a bug? I'm playing on PS4 btw