Remove the "Membership Level" Edit Section from User Profile Edit if viewing the Profile from the frontend using a plugin like Theme My Login's Profiles Module.

remove_membership_level_profile_fields_on_frontend.php

<?php
/**
 * Remove the "Membership Level" Edit Section from User Profile Edit 
 * if viewing the Profile from the frontend using a plugin like
 * Theme My Login's Profiles Module.
 *
 */
function remove_membership_level_profile_fields_on_frontend() {
	if ( ! is_admin() ) {
		remove_action( 'show_user_profile', 'pmpro_membership_level_profile_fields' );
		remove_action( 'edit_user_profile', 'pmpro_membership_level_profile_fields' );
		remove_action( 'personal_options_update', 'pmpro_membership_level_profile_fields_update' );
		remove_action( 'edit_user_profile_update', 'pmpro_membership_level_profile_fields_update' );
	}
}
add_action( 'init', 'remove_membership_level_profile_fields_on_frontend' );