Private settings not saving

hi, on my profile page i'm trying to change the privacy settings but it's not saving. I'v played about with the settings in admin (image below) but nothing works.


And i'v disabled some plugins i'v just added but it wasn't them ..... help to fix please :) 



so this when i change to 'private' then save goes back to 'public'





and i tested on off with this but still same :( 





thank you