which is correct way install- trunk weather strip ?

OK everyone. Last weekend I attached my weatherstripping as shown in the pic (Steele Rubber Products), but the trunk was extremely difficult to close. I was able to determine that the problem was along the rear edge of the trunk. This led me to believe that the strip along the rear edge should have been mounted vertically instead of horizontally, but then I found this thread. Is it common for the trunk to be very difficult to close?