Buried maps sometimes duplicates and it's very sad because for example in my world, i have tons of buried maps and 3 of them is just a copy of one of them, i worked hard to gather all of them, but then it duplicates. is this normal?

Put the summary of the bug you're having here

What I expected to happen was...:
to have more maps.

What actually happened was...:
It duplicated again and again.

Steps to Reproduce:
1. Once you got for example a map then got another, the second map will be duplicated.
2. ...
3. ...