The 5k HP Problem

Hi Guys and Girls, I'm Boogoti and I main Sion Jungle. I love everything about this champion and I just love tank junglers ever since I started playing this game 5 years ago. With the introduction of the Cinderhulk jungle enchantment giving 25% bonus hp I just cant say no to this item when im jungling with any tank especially Sion. What I have noticed with this new jungle item is that it is a lot easier to hit above 5 thousand HP on a lot of the tank junglers like Sion, Sejuani, Maokai, Amumu, etc. But here is where my huge problem begins. I'm not sure if this is a visual bug or not but just hear me out on this. I know I may sound a little bit like a new player when I say this so here it goes.

When I hit the magical number of 5 thousand hp on Sion, something interesting happens with his HP bar. It seems like whenever you have above 5k hp just from items or after you turn on your shield, your health bar will start appearing like you actually have less hp. It's crazy when I see this because when im sitting at 5k hp I look up and see that my health bar is acting like I have around 2-3k. The individual bars are a lot bigger making it look like im not that beefy. Then, when I charge in I actually notice that im getting chunked really hard regardless of my mr and armor. I have actually tried selling my items to get back under 5k and then his HP bar goes back to normal and I go back to being the unkillable beat that late game Sion is. My genuine question is, has anyone else had this problem? Is it a gamebreaking bug with Sion where his hp bar actually effects something in game? Or maybe it's just a visual bug with his hp bar.

I hope that someone can help me with this because I really hate having to alter my build to get under 5k to just feel tanky again. Thanks for reading this and sorry if this post is really bad, I never post on any forums but this is a big problem for me. Thanks everyone and see you guys on the rift.

Boogoti