Hi,
There's a Pose Morph Tag on your Mesh. It is in "Animate" Mode. It means that Cinema 4D will give priority to the poses from this tag (currently the "Default: Mesh" pose) and ignore your latest modifications.
To make modification of your character, switch to the Pose Morph "Edit" Mode and create a new Pose with the "Add Pose" button.
You could also delete the Pose Morph tag, if you don't need it during modeling....