When you are playing as Kled when you're not riding Skaarl and your Maw's 
(or 
) passive pops it's shield it shields Skaarl's portion of the health bar instead of shielding Kled's portion.
or passive pops, shielding Skaarl's half of the health bar, not Kled'sPretty sure this was intended for ease of tracking. Technically Kled's health bar is the only real health bar, and Skarrl is a shield. Therefore, all shields theoretically would stack inside Skarrl's health bar.
Its more than visual, Maw wont work properly if not on Skaarl making it useless since for it to pop you need to have less than 30%health. So the shield applies to Skaarl not Kled and for it to activate you have to be Kled so the shield is never utilized. Still a bug in patch 6.17. I don't believe this is intended since it applies to the actual shielding not working and not visually misplaced.
