why is facebook not showing all my friends (only the first 36)?

I recently created a facebook account about a week ago. I’ve added 49 friends.
When I go to “Account->Edit Friends”, I only see the first 36 friends I added.

When I go to my profile and click on “Friends (49) on the left side, I see all 49 friends in a list. However in the “Search by Name” field, it will only give me results for the first 36 friends.