Could you please share the screen shot of the export dialog box.
Are you exporting from a copy or virtual copy? If you remove a caption from the original the copies are not changed. Ensure you remove the metadada from the actual copy being used for export.
I believe you have placed a Watermark on them. This is an Option in the export dialog window, to place or not to place a watermark on export.
That appears to have been the issue! The Watermark dialogue was checked. Thank you!!!