Not rendering properly

Hello,
I’ve come across a problem with rendering that I’ve never experienced. I’m wondering if I have hit some button by accident. I’ve rendered it at full scale and at the preview scale with the same results. I don’t have motion blur or OSA selected. Does anybody have any suggestions? I’ve attached an image to show the problem. Thanks so much,

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Looks like you have Fields selected in the render settings.

yep, that was the problem. Thank you so much!