There are a number of checks to perform if the windows do not move smoothly through their travel. It may be interference between parts, the window regulator, or the window run channel.Google+
Car Problem Reports
Jeep Liberty Numerous Causes if Windows Don't Move Smoothly Through Travel
Jeep Liberty Problem
Average Mileage: 77,947 mi (50,000 mi - 150,000 mi)
Visitor, 2007 Jeep Liberty, 150,000 mi
The front windows are slow in raising; passenger window makes a whining noise when raising; both don't raise in the correct position all the time. They have both had the recall work done on them
Visitor, 2006 Jeep Liberty, 60,000 mi
went to dealer several times still same rubbing .
Visitor, 2007 Jeep Liberty, 51,788 mi
Haven't - and neither has the dealership!