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Hello. I can see that you have a problem but it's difficult to determine what the problem might be without seeing the PSD file.

You need to create an all white and an all black layer at the bottom of the layer stack, then turn off all other layers and and go through them one by one until you find the offending layer. Compare each layer to both a white and the black background.

To me, the remnant looks like it could be text. But if through some merging process you did that you can't back up to, you may have to take the time to mask out the the C-like pattern.