Welcome to BuddyDev support forums.
There are 2 possible reasons:-
1. MemberPress applying restrictions on BuddyPress page
2. Or BuddyPress page not being configured.
My expectation is the first case. Try disabling MemberPress BuddyPress integration(if you have it enabled) and then taking a look at the BuddyPress directory pages to see if there are still any restrictions applied.
If that still does not work, I will suggest approaching MemberPress support.
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