BuddyPress.org

As jjj explains in that thread, you need to customize your homepage. You will not get the default homepage to work as is with your current set up. You can either have a static page and the members theme, or a the default home theme with a members theme. But you will not be able to have this sequence:

Your own static front page > Default BuddyPress Home theme > BuddyPress member theme

You need to follow jjj’s advice.