Hello Ahmed,
On this website I have 5 test users:
http://s473313392.sito-web-online.it/trial1398964420/members/
The newest member (Kate Moore) does not appear in the search results.
Instead, other users appear if I insert name, surname or part of them in member search. I got this result only after editing their profile.
In summary: a user does not appear in the search results after the registration but only after he edited his profile.
Ahmed, any suggestions?