Connection log missing after update

I have a macbook pro with macOS High Sierra with teamviewer version 13. I've been using teamviewer since version 9.The other day I wanted to review the logs from my connections, but to my surprise i have all the logs from version 9, version 10, but no version 11 nor version 12. And from version 13 i only have the logs from last month. Which means i lost all the logs from tha past 2 years. I'm the only user of this macbook and nobody had access to it. 

What could have happend?

Thanks