Converting a transparent line back to solid

I have a 40% white transparent white line over a black box. After working with the doc it for a while, I wanted to change it to a solid hex color (333333) versus a transparency. However, Illustrator is now telling me that I have a 100% white line, even though the 40% white is displaying in the toolbox. I can change it to another color, but the color always displays at 40%, but shows as 100% in the toolbox? Adjusting the transparency doesn't do anything.

This has happened with other docs in the past. Somewhere in the process of working with a document, transparent lines/boxes become seemingly uneditable?

Per the attached image, the line "should" be displaying 100% white but is not???