After changing database statistics count just 1 visitor per day!

Hey guys!

I had a very difficult transfer of a wordpress multisite. The domain was the same, I change the database and installed the website new.
After configurate the multisite I transfer manually the statistic database tables into the new database.
The statistics run since 5 years or more, so we have really a lot of entries.

That didn’t seem to be a problem.
But now the statistics just count one visitor per day.
Thats the statistic summary:

Visitors:

today: 1
yesterday: 1
last 7 days: 7
last 30 days: 30
last 365 days: 10.546
total: 105.237

Visits:

today: 12
yesterday: 7
last 7 days: 370
last 30 days: 5.213
last 365 days: 80.467
total: 1.625.933

You see, that’s strange, isn’t it?

I thank you very much for your help!
Regards,
Monique