Activity Reset 1 week only?

[DriftKing]

I've read that it requires 14 post on a 14 day period to have a 14 activities.

According to this:
The activity number is determined in this way:
time = number of two-week periods in which you've posted since your registration
activity = min(time * 14, posts)

Why do some account do gain more activities than others? I've look at some of my friend's profile and saw this:

My friend's account was created July 24, 2017 and as of today it already has 56 activities with 60 post. While my other friends account was created on July 21, 2017 and still has 42 activities with 50 post. Is there any reason for this? I'm just a newbie wondering so I can level up my account faster. Thanks for answering!

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[actmyname]

There are activity periods. If the latter friend did not post in the new activity period (or refrained from overlapping with the other in any way) then they would not gain the privilege of the period's potential activity.

[BurhanPSG]

there is a possibility that your friend does not post according to the rules, for example if your friend every day ngepost at least 4 with the distance of time already specified will be different with you who ngepost with a lot but the time between post 1 with another very close.
I think this is one of the examples / problems that caused your account activity to increase for a long time.