The only way that could be a factor would be if the valve body was so badly worn that the cartridge could not seal the inlet ports, which is not likely. You probably have a different problem but we cannot diagnose it without being there. There is an online source for a Moen style cartridge that cures the common Mixet problems.
Nomix Inc. repair cartridges that fit Mixet brand valves
It is a Moen style stem to replace the Mickey Mouse one that Mixet uses.