Odd memory sheet binding

[reagle]

When I try to see the memory sheet I get: 'no command for "alt+shift+m".' When I look at the command help, I see an odd binding: Alt+Shift+Shift+M.

sheet	module	longname	keystrokes	description
TableSheet	memory	open-memos	Alt+Shift+Shift+M	open the Memory Sheet

Editing the keystrokes cell to "Alt+Shift+M" is unable to change it. This config setting has no effect:

TableSheet.unbindkey('Alt+Shift+Shift+M')
TableSheet.bindkey('Alt+Shift+M', 'open-memos')