What version of FileMaker are you using?
And is the map displayed in a web viewer or in a container field? (Your report mentions container fields, but I need to be sure.)
You may have encountered a known bug, but I'd need to know the above details in order to be sure.
I'm using FileMaker Pro 13.0v9 and all that I am using is container fields, no web viewer.
Sounds like a known bug if the maps are PDF files. But if so, check and see if the field is set up as an interactive container field. (These are settings set up on the Inspector's data tab way at the bottom.)
For More Information see: http://forums.filemaker.com/posts/9b3a2c7571?commentId=266047#266047
This is one of many acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: https://www.dropbox.com/s/jt09b82i0xijbu3/FMP%20Bugs.zip
The work around would then be to insert a graphic image file of the map, just as a Jpg file and use a non-interactive copy of this container field for printing. (On Mac systems, you might just need to set up a layout for printing where the container field is optimized for images instead of interactive content.)