Xfinity Stream SD channel programming aspect ratio on computer

When streaming older SD shows on my computer (and my phone too) the actual program is sqeezed horizontally and a vertical black bar apears on each side of what would normally be the SD program display area - please note theese are vertical bars on each side and not horizontal bars at the top and bottom. Also note that this is streaming in a chrome window and behaves the same when it is and isn't full screen. When a commercial plays, the two black vertical bars disapear and the aspect ratio of the programming are as expected in SD. Please see the two screenshots as an example.

Squeezed programming:

Not Sqeezed during SD commercial - please note the commercial is SD and not HD. This is as expected on an SD channel and is the proper aspect ratio and not distorted like the program shown above.