OGH% decreasing in battle?

Hello, I joined Neverwinter a couple months ago and still building my devout cleric. I manage to get to 85% ogh but whenever I am in a battle, my ogh goes down the drain :( And I still haven't figured out why?

Is it something to do with my gear or is it a bug?

https://preview.redd.it/yeb9xh3zhvmc1.png?width=1266&format=png&auto=webp&s=911cc95fb0acd94490f2f88faf419eed7a36b3ed

https://preview.redd.it/ke9iwtszhvmc1.png?width=1281&format=png&auto=webp&s=e89b87be4e53df35245d05f39f355c09ac9d53da