Maps in item frames get brighter when hovering over an item in your inventory
I thought the map would stay dark
The map got bright
1 Open your inventory with the map in view
2 Hover over an item and the map will get brighter
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I also confirm this. It also happens that if you stare to the sky, it gets darker when hovering over a item
Duplicate of MC-605.
I can see no difference in the screen shots you posted. I tested it for myself and found nothing.
Edit: I now see it. It is very subtle on my monitor. Not a huge bug, if a bug at all. Though I wounder why this happens.