I have multiple albums twice. Of I Check the Version Info Room shows me that they are exact the same. Same directory, same name, same file type etc.
in the directories are online one folder with the album.
Welcome to the forum! You might need to merge them manually.
This could be this issue.
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I recommend everyone with this problem first restart the Roon Server Software from the web page. This problem crops up for me from time to time when the server has been running for an extended period without a reboot. If that doesn’t fix it, then try the other options. Don’t start merging albums because they’re not actually duplicates. They’re an indication of database problems.
Yep, LevelDB being the issue 
Yes, then the duplicates disappears for a short while, and then they come back sooner rather than later with different duplicates.
This is a short-term workaround, but it’s not a solution. The problem has existed for a year, they should just fix it
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