Am I understanding correctly when it states I can only gain 14 activity points every 2 weeks?
Yes, look at here:
time = number of two-week periods in which you've posted since your registration
activity = min(time * 14, posts)
Be careful about this time. The time is your first post time, not your register time.
But, I have a ideal, if we can get more activity, if we are more activity in this forum.