I have a large InDesign document with many images that are linked into it as PDF documents. I run a preflight check in InDesign to make sure everything is in the CMYK color space. These images keep getting flagged as being in RGB color space, but when I go to open the PDF file stored in the Links folder, it is in CMYK (not RGB). The Printing Press tool in Adobe Acrobat tells me that it's all in Device CMYK.
Any ideas why the preflight would be flagging these, and how I can get it to stop/fix the linked images if I need to?