For the shortcode [ms-membership-signup] I had to hack the file (which I HATE doing) to get rid of "Add Membership Level" title above the form.
The file I hacked is wp-content/plugins/protected-content/app/view/shortcode/class-ms-view-shortcode-membership-signup.php
I realize updated will erase this however is there a fix planned for this any time very soon? I saw another post with the same question and but no resolution yet. Post is here: https://premium.wpmudev.org/forums/topic/why-cant-i-edit-the-registration-page