Please have a look at the questionnaire page if you have a spare minute.
Mine does that all the time. I looked it up the other day , it's a sign of affection.
If they rub their face around a human it's to add their scent i.e. make the human part of the group.One of mine use to run up the stairs and push her head through the banisters at eye level to me if she was being ignored. . We would then head rub.