I have a a strange problem. After upgrading from 3.6.0 to 3.8.1, statistics of visitors and unique visitors per hour or day are shown lower that real amount,
I have invalidated and re-archived the reports but no change. The data still about half of the amount it should be.
I know the data is invalid because:
- The amount dropped abruptly after the upgrade
- This happened for all of my sites
- Real-time visitor count data is inconsistent with overall data
- Page counts are still like before but visitor count shows about 40 percent decrease