My TV is set to the 16:9 ratio
That's why everything looks "normal" to you. MG and MG/HS were produced in 4:3. That your receiver is elongating the picture masks the problem Buzzr is having. Which station and digital subchannel are you watching and what market is it?
The small TV I have in my home office doesn't have any settings to adjust aspect ratio (just a useless zoom option) so I was seeing it as it was being provided.
One possibility is that the receiver is elongating the picture in spite of the fact that there are no user settings to control it.
At my former station we had a pair of "professional" Sony OLED monitors which cost $3,000 apiece. These monitors did that exact thing: they made all of the incoming video 16:9 to fill up the screen and we had no control over it. This bit us in the ass many times because if a field camera was set to 4:3, we had no way of knowing it because these monitors artificially made the picture 16:9 and thus disguised the fact that the picture was coming in at 4:3, no matter how loudly the directors and T.D.'s screamed and hollered.
Eventually these two $3,000 monitors stopped working and were removed from service. Rather than try to fix them in house or send them back to Sony, poof! The monitors disappeared in a puff of smoke. Nobody knew where they were or what happened to them. $6,000 worth of capital equipment vanished into thin air. They did not have asset tags and there was probably no record of their serial numbers.
What makes this problem difficult to trace is that monitors can disguise these maladies. I suspect there is a problem at Buzzr judging from the fact that their commercials look different compared to programming.