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Check to be sure your pixel aspect ratio in your encoding settings is set to square, and in the preview window, you are not scaling, or fitting.
First, how exactly are you viewing the export?
Second, what are your export settings?
This solved my problem. But i still don't now why is this happening. I have video that is DV 720:576 PAL pixel aspect 1.0940, when i set same parameters for encoding it changes aspect ration. But when i set pixel ration to square and stretch to fill i get correct result. H264 with correct aspect ratio. It is probably bug with encoder.
Everything is set on default. I put video on timeline, start exporting, i chose format H264 and preset Match source and I get video with wrong aspect ratio at end. After rendering.