Unwanted Freeze Framing

I have a short video that opens with a PNG graphic and dissolves into the first shot of a pre-edited video. For some reason the fist frame of the video is staying in a freeze frame as the video plays. If I stop it then play again the freeze frame goes away.

The problem is that it's Exporting with the freeze frame. This is my first project with HItFilm so I don't know why this is happening or how to correct it.

Can anyone provide an answer?

Thanks.  

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