Primarily used to intentionally overlap inks for a number of reasons, overprint can cause unexpected results. We suggest that you turn all overprint objects off before submitting your files.
Unexpected results may occur if you have accidentally set certain objects to overprint. Always check logos and other artwork before submitting.
White Type - Another common file setup error is using overprint for white type. If you are using white type and set it to overprint, it will result in the type "dropping off" the printed piece.
In order to prevent the type from dropping off in your printed piece, we recommend you turn off all type set to overprint. What can also solve this issue will be to flatten all the layers in your file and convert any Pantone and RGB colors to CMYK before submitting your files.