At the risk of sounding arrogant, maybe the movies you play where not in 16:9 format. Very few movie I own are exactly 16:9 which is 1.78:1 ratio. Many movies aspect ration range usually from 1.85:1 to 2.35:1. Those are not the only aspect ratio out there but are the most common.
On the other hand, you may a bad setting in your Bravo player. I don't have one, but I have a L500 connected through DVI. When using DVI, the L500 doesn't offer any setting for aspect ratio. It takes the singals as it commes from the player. So it's either your Bravo not configured properly or the movies you watched are in a wider aspect ratio than 1.78:1.