A feature. Each column is pinned globally for 2 weeks. They unpin automatically when I do it correctly. 
There are some prior threads on this. I’ll find and link.
This can be helpful:
How to subscribe and get an Email for new columns by Cecil.
Click on the category (forum), Cecil’s Columns/staff Reports
Click the bell icon button to the far right, after the New Topic button.
I recommend selecting Watching First Post as this will let you know when a new topic is started in this forum.