No it's not just you. That's the way this particular program looks. I have seen it before and it is the norm for this program. It still has good details but it does not completely fill the 16x9 screen.
On Starz One Of The Movies They Are Showing Is "Holes". Fun Movie But Not HD. Starz Upconverted The 4:3 Version To 16:9. That's So Strange, Why Didn't They Upconvert
The Widescreen Version?