I just received more clarification about this issue because it was reported to me. Visitors/members are clicking on a link to a particular forum/post from Facebook. This post is displayed on the Portal as well. Thus, the many views to that particular post are not being displayed either on the Portal nor in the Forum where the post is located... if that makes any sense? hehe
In short, people are viewing a particular post which is also displayed on the Portal and the number of views doesn't change for days at a time.
Another question which might be relevant is: Does the "views" reflect only members who view a post or anyone/everyone who views a post?