If you've a stack of map locations selected and right click anything all of these maps will get the same location information but they keep stacked until you try to place them to another slot where you can't stack the items anymore.

I assume the locations should work the same as the buckets means once you "fill" your map location it becomes "unstacked" and placed to a free slot (or drops).

The other thing i saw was when crafting several Map Locations at once (by shift click on the result) they don't seem to go into one stack directly but instead temporarily place in different slots before being stacked somehow automatically. This last point is not really a bug but you can see it and it looks somewhat weird.