Four Clips into One Project

I am trying to put four clips back to back and publish it into one mp4 file. When I play the clips in the timeline in Replay, they play correctly, but after they are published and I play back the mp4 file, the visual goes in and out and is blippy at times. 

Any thoughts on why it would play normal in Replay and has issues after it is published? My original clips don't show like it does after I put them all together and publish. 

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