Move matomo to new server

We have matomo on a windows server. Now we have moved to a new Linux server. We dumped the database and inserted it on the new server. Everything works well, exept one thing. The number of unique visitors on the new server is much lower on the new server for the year 2020. If you check for 2019 everything is correct. Also per month the numbers are correct. Anyone has any idea? Much appreciated!
(Is it a bug or a feature…)
Best regards

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