The macro library for the .rui does not have a function to delete any unused or no-longer-used macros, so that’s probably what you’re seeing. It has been this way since the beginning of the new toolbar system. I have tons of these as well, I did some cleanup, but a number remain still. One way to get rid of them is to edit the macro library directly (via the Macros command interface) and delete any unused macros you find.
@Helvetosaur what size is your .rui file? I made all new .svg pictograms for my toolbar but now the file has gone from 550kb to 4000 kb . Is this correct?