Why is my Custom Meta Box Field Inputs NOT saving?

You do not verify the nonce correctly. Try this, it should work:

//1. verifies meta box nonce (to prevent CSRF attacks)
if( !isset( $_POST['work_meta_box_nonce'] ) || !wp_verify_nonce( $_POST['work_meta_box_nonce'], basename( __FILE__ ) ) ){
        return;
}

For more info on wp_verify_nonce see here.

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