Rejection by Technical Issues, Vector Illustration

Hi guys!

I've got second time rejection of the same vector illustrations by the following reason:

Your file has one or more of these issues:

• Your vector file contains a raster/bitmap image, and vector files must not contain raster elements.
• Your JPEG preview file has been compressed too much, so textural problems have occurred in the file.
• You didn't use anti-aliasing when exporting your vector file to JPEG, so there are problems with lines on the JPEG file.

I checked EPS using Document Info, it says that no raster found.

How they check is there any raster elements or something else is persist?

And I set anti-aliasing settings in Documents Raster Effects Settings for saving JPG files

Can you help, what kind of  rejection problem it can be?

Thanks!