[BUG] Key binding issue

Hello,
I was going to bind a script to s-m in the root keymap, however, I 
entered the command
definekey root S-m exec myscript.
I quickly realized my error and made the change so that it was bound to 
super-m and not shift-m.
Then I went on with my day, until I needed to type a capital m. After 
some frustration in the terminal, I remembered my earlier mistake, and 
then attempted to unbind capital m and S-m.  According to ratpoison, 
neither key was bound.  Is this a bug?  Is it not possible to unbind a 
key that is bound to a capital letter using a shift and a lower case 
letter.  Can anyone reproduce it?
I restarted ratpoison with the restart command, hoping that this would 
reset the keymaps, unfortunately the binding persisted.  Is this another 
bug?
Thanks!