The same key/combination can be used for multiple different functions in Revoice Pro, depending on context.
When editing custom keyboard shortcut sets, please make note of the Mode that you're editing the shortcut for.
In the Revoice Pro 4 set for example, the "I" key is used for the cutter tool in both the APT and Warp modes, and for Split Pitch Limits when editing Warp Pitch Limits;
Changing this shortcut for the APT mode will not change it for the Warp mode - each must be edited separately.