Running multiples of the same map data in different versions is never a good idea even if only one is selected in 'My Maps'/'Map Info'.

Is it possible you have mis-matched versions of maps and supporting files like Foursquare? I'd remove all detail maps and their supporting files from device (don't remove basemap, tz map though), disconnect from PC to re-boot it (so it re-creates a new GarminDevice.xml file) and then connect it to Garmin Express without a microSD card inserted to reload current maps and files as offered only to the internal memory.

PS: Backup everything first of course!