Seems like this 14 activity limit isnt working i got 16 activities in 2weeks.
No, it seems you don't understand the activity system correctly. It's 14 activity every two week period. The periods are fixed and do not start when you sign up so you could get 28 activity in two days if you sign up a day before the new period starts.
And when is the update?
After 1 week i had the 14 activity, and after another week i had the 18 but now it didn't upgrade to Jr. Member.
What did i miss?
We follow this spreadsheet:
https://docs.google.com/spreadsheets/d/12saLhlUoqIdairxzuSPu6EYGrt7FN2lOstO1yDjCEbA/edit#gid=1012758442Last activity update (for all Bitcointalk users) was 21st November and next will be in two weeks at 5th December.
Now you have 28 activity and 48 posts.
To get activity of 14 points from this 2 weeks period (11/21/17 - 12/5/17) users need write 14 posts or at least 1 post if they wrote more posts before this period.
In your situation you did everything to get 14 activity points at 5th of December:
You have significat number of posts - 48 (28 activity from last period and 14 from that period is 42 - you have 48 posts, so more that you need)
You also wrote at least one posts in this period - I answer to that post.
So right now you just have to wait untill 5th December.
When you open new account, at the beginning it is more complicated, because everything depends on the moment (day) in this 2 weeks period you establish an account..