Problem with opacity

Greetings everyone, Im having an issue with a container background color. I currently have it set up to 30% Opacity, and I want to change it to 20% opacity, however, whenever I input 20% or move the slider over to 20%, it immediately goes back to 30%. This issue is present on this specific element and no other in my website. Tried to reset it, tried to reload the page, tried to reset caché. what am I doing wrong?

Could you share the video of the situation here with us?
along with this, did you try to duplicate this element and re-add it completely?