User IDs and Unique visitor amounts differ suddenly hugely

@DigitalEngineering wrote:

Hello dear Matomo folks!

Our website has normally had quite similar numbers for user IDs and unique visitors. For some reason, the difference is 100%, thus the number of unique visitors is 2-fold compared to user IDs…

Would you know any potential reason behind this? I attached a graph demonstrating the difference.

Thanks a lot in advance!

Best regards,
Amanda

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