When I use the main navigation at mobile (iOS or android), and I have active notifications, clicking on those notifications results in a dropdown that gets cut off. Clicking on the "Notifications" or "My Messages" links only toggles the drop down message previews but doesn't go to the full "Messages" page.
Also the preview formatting has a similar issue to my other ticket in that it places a backslash before apostrophes. This thread on Buddypress forums offers a possible solution - https://buddypress.org/support/topic/backslash-apostrophe-bug/
Here are screenshots to show what experience I'm having at mobile.