When I put a map into an item frame then another map in another item frame the first map changes to the second one until the second one leaves my sight

Put the summary of the bug you're having here

What I expected to happen was...:
the maps stay the same

*What actually happened was the first map changed to the second one

Steps to Reproduce:
1. You put two item frames next to each other
2. You get a filled map put it in one item frame
3. You get another filled map and put it in the other item frame and look at both maps at the same time