I'm afraid that member roles are calculated over a 30 day window, so they do fall away if you aren't active. However, there are also permanent roles that take longer to earn. That one remaining badge (or icon) is there because you earned enough points in the cheerleader role to get it permanently.
It is a little lighter in color because you haven't earned it over the last 30 days.
There is more info on member roles here: http://youlookfab.com/backstag.....ber-roles/