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?
This was a item to be addressed in version 8 which got shelved.
Meaning some user control over the cache items enhancement.
Some features need a trigger/action to update and some have a hard coded time.
v8 was going to give us the ability to set time specific values for all of them.
As far as I can tell it is not in v7.6 nor v7.7
So it would be a mod at best for a while.