HP Bar Acuracy & Zoning issue.

[Baler]

I send my pet in to battle and my friend heals my pet but he doesn't always see the same health amount that I do for my pet,. generally After my pet gets hit he will still see the pets health for what it was until it gets hit again.
Example: I send my pet into battle and it gets hit by a monster bringing its health down to 80%, my friend still sees my pet having 100% untill it gets hit again lets say down to 60% and then my friend will see it's health at 60%

The second issue : I zoned with my friend and I could see him but he could not see me. he said my health bar in the group window looked like I was in another zone. When I said something in local chat, it was visible, but not my character model what so ever.