Can anyone explain how zpool calculates the timetravel algorithm on its website?

With their benchmarks, everything seems normal for me (about 40-50 MH/s per 1080 Ti).

However, the total zpool timetravel hashrate displays only 298.6 MH/s, which is laughably wrong with over 109 miners hashing on timetravel.

My own cards display something like 850 KH/s combined on zpool's website. I'm totally confused.