Ok, that was hard to find. Thanks to your pictures we could figure it out where the problem was. It was easy to fix, but very hard to spot.
The cache was saving current day info when the administrator displayed the overview table.
In fact that is an error. The cache system has to cache everything but current day statistics, since current day change everytime.
Version 1.7.40 should work as expected, where we added also advanced checking for corrupted Maxmind databases.
Thanks for your help in this matter!