Steps to reproduce:
1. Create two hosts with the same item, however make sure different values are collected
2. Create two maps, put each host on to each map
3. Create a dashboard with map navigator widget, map widget and item value widget. On item value widget make sure "Host override" is set to map.
4. Open the dashboard and observe how clicking the map which is second on the list does not affect item value widget. Only specifically clicking on map object will change the item value widget.

Example screenshot where map two is chosen, however, item value widget still shows information for map 1: