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In order to get an idea of what might be happening, we need you to give us detailed information about the parameters of the clip you are working with. You could be working with a P.A.R. too narrow, we don't know it at first glance. You could use the MediaInfo app to get clip details.
I fixed it, you were right my P.A.R was to narrow, thanks.
Make sure the preview or proxy setting match the original/sequence settings.