Maps went blank (3 maps out of 4)

Put the summary of the bug you're having here

I copied 4 of my maps and put them on the item frame. After about 3 days, 3 of my maps become blank as well as their copies on the item frame even tho one of them still works fine.

 I don't know what triggered it (and I didn't die) I was just roaming my world with those 4 maps in my inventory. all of them are lvl 4 maps with pretty much of discovered areas.  Now, they are not even showing my location and went all blank while one map still works.