Download Counter not always correct?

[Arno]

Bug reported by user IngoLammers:

However, I'm pretty familiar with user groups. I use five user groups, and with each one, I click Download 10 times, and it counts 10 times, even though everything is set up so that a user, or rather IP, should only be counted once within 60 minutes. It gets extreme when download managers get active. They immediately add 5-20 entries to the log, and all of them are counted by the download counter.