Don't mention it.
Yes, activities are updated twice a month for people who already reached their maximum activity.
This what happens, 14 activity is what someone can earn for 2 weeks so whether you post more than 14 for that period, still you'll get additional 14 activity and 28 activity for 1 month.
Gotcha! whats about Merit ? I have Merit:0
Continue to make meaningful contribution to the topics raised and maybe join translation to earn merit. Merit should not be a thing to bother about because if you make a suggestion and someone finds it very helpful, the person can give you merit for that as long as it is very helpful.