I have a feeling my point is not being illustrated well enough. I grabbed some screen captures as visual aids. I’m sure this is something simple that I’m forgetting, or just don’t know about.
Here’s my sequence settings(with the aspect ratio at 720×480):

that produces this image in the canvas(which looks the way it should):

But, when I export using Export/Using Compressor… Then set it to “DVD: Best Quality 90 minutes – 16:9//MPEG-2 6.2Mbps 2pass 16:9”

The resulting video comes out looking squished(stretched horizontally/fat)

The exported video is obviously wider than the image in the canvas, but I don’t know why. I’ve tried many different combinations of sequence and export settings but can’t figure it out! Can anyone please help?? Let me know if you need any more info. Thanks