Problem exporting Quicktime 1080i

I'm using PPro CC, sequence and footage is 1080i 29.97.  When exporting to a Quicktime H.264 file, I select the preset for 1080i 29.97.  Upon export of the file, I can re-import it, and PPro interprets it correctly as 1080i (upper field first).
But, MediaInfo interprets it as Progressive (under Scantype).
I've searched these forums, and even googled for the answer, but can't find anything.
I don't know if it's a bug in PPro (or AME), or in MediaInfo.
I work for a TV station, and all of our spots/shows go through FlipFactory, which I believe scans the files the same way MediaInfo does, and don't want issues.
Any help would be appreciated.

Thanks everyone for getting bak to me. Your advice was helpful. After messing around further, I noticed that in the viewer window in FCP there is a little pop-up window which allows you to choose the size of the window as a percentage. At the very bottom of it, there is a choice that was checked off: "Show as square pixels." When I uncheck that selection, then it plays the movie within FCP with the same aspect ratio as the exported movie in quicktime.
As someone pointed out above, this has to do with the dimension of the pixels in DV, which are rectangular. So my new question is this:
Which is the correct way to display the image? Should I have the "show as square pixels" checked or unchecked within FCP? Or is the true image when it's unchecked, and the way it appears in Quicktime after exporting the movie? The quicktime movie looked stretched to me, but maybe that's just becuase my eyes were used to the "show as square pixel" version within FCP.
If anyone knows the answer to this, I'd appreciate it. And thanks again for all your help.
Bill

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