No command accepts characters in a keybinding

[Saevon]

Any keybindings with characters in them (e.g. : to go to Ex Mode) take priority over vim commands. Specifically for commands that take a character as input

r: opens the Ex Mode rather than replacing the current character with a colon
t: does the same rather than jumping to the next :

The commands remain in their unfinished state as well, capturing the next character you press.

If you create a sublime keybinding which consists of just characters !! or ? these also take priority.