Map Device ate 4 sets of 6 scarabs

Started with 4 sets of 8 scarabs in map device. Went to put in 3rd map of the 8 I was running, and scarabs were gone from map device :(

Lost 12 gilded + 12 polished/rusted scarabs. Game never crashed or reloaded, just finished looting 2nd map, went to put in 3rd map and scarabs were gone.