Timeline is Consistent, Please Help

I just started using Hitfilm Express, and I've run into a strange issue. I'll add an image to a composite shot and key frame animate it. When I preview the few seconds where that image is on screen, it looks fine, but when I play back the composite shot from the very beginning, and when I export it, everything lags behind by a full second or two, meaning all of my key frame animations are now way off.


Any help would be appreciated, thanks.


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