Overprint is exclusively used for intentional overlapping of inks for numerous reasons, but it can originate unexpected results. All the overprint objects are recommended to be turned off before submission of your files.
ON SCREEN VIEW
In this, the logo had to be overprint. The colors in logo and colors in the background are mixing. If you mistakenly set certain items to overprint, Unexpected results can transpire. Before submission, check your artwork and logos.