Since Word does not have commands "blue" or "black" they must be something you created.

I suggested macro names before, but I guess you could have named styles "black" and "blue."
In the assign keyboard shortcut dialog you could look under both Styles and Macros for the names.


If you want someone to tell you whether your are working with custom styles or macros, you could create a sample document where they were used and post it here.

Attach a Sample File Demonstrating the Problem - Here's How
The sample document may have highlighting rather than shading or may have styles you are not seeing.