Rendering applies weird squares over my model When I do the final render its all good until 99% and when it reaches 100% then it shows out of nowhere this random square.

How can i fix this? this square doen't exist in my collection. also i have tried CPU and GPU and same problem with booth of them.
UPDATE; i moved my camera away and this happened![
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You have this in your compositor;



It's showing up at the end because it's the last thing to be rendered and composited in.