Missing friends on your friends list?

Since they fixed the join groups recently ive been missing a couple friends on my list I search them in game it still says we're friends and i dont even get the notifications they are online in the game as well the only way i can join them now is sending a invite in PSN which sometimes works  but mostly joining  them by a third friend that sees them on when i cant this work around works best after doing this I can see them again on My friend list again  just by joining them? Anyone else have this problem leave a comment so they know this is a issue?