back of holding buck

I have a character with a back of holding. the problem is that it´s not changing my

carrying capacity. I tried to have th UI fixing this. It tells me that it can change my

carrying capacity in the system, but the chang don´t appere on my character sheed. I was told to change it manuel, but there dot seems to be a funktion to do that, and the UI can´t tell me how to fix that…plz help