9 friends on someone else's Facebook timeline?

[Miri]

When regarding my boyfriend's (and not mine) facebook timeline... Whenever I visit his timeline, the 9 friends shown on the left hand side are always the same 9 people, just in different order each visit.. And when my friend visits his timeline, the same thing happens but with different set of 9 people, order also being shuffled each visit. Could someone tell me why this happens? These people are not common friends of either of us, just randoms that come up 100% of the time.. It doesn't necessarily mean that HE is most in contact with them right?
I'm not worried about him cheating actually.. These 9 people are not even his closest friends.. Some are girls but they are not even the girls he previously dated.. Mostly coworkers.. I'm just curious I guess.. Thank you for your time in answering anyways..