Why are copies being randomly added that can’t be selected or modified?

If you have overlapping call numbers in Maps, Alexandria will display a duplicate title or a duplicate copy. If the copies can be modified but were not intentionally added, this may be from an import running too many times and adding a new copy each time. You can solve this issue by separating your Maps so they do not have overlapping call numbers. (This will also ensure the correct map displays in Researcher.)