Luck bug?

Why my luck cap is like this? I added 75% luck but this luck still the same. I Added cyan luck but it won’t gain. Is this bug? I got hireling btw.

Get higher luck on your hireling and it will go up. Currently it seems to be the cap for both your characters is 650% and adding above that will not increase luck on your second character. So in order to achieve 650 luck, you need both characters have 650 luck.