@IRD-PoolOperator: Your pool still shows the wrong global hashrate (calculated from the correct difficulty) because you have a wrong block time (240s) specified (or just forgot to change a default value). Should be 175s.
Mentioned two months ago:
https://bitcointalk.org/index.php?topic=2150442.msg25586036#msg25586036Reading that I see that your pool used 120s back then. Now 240s. So I guess you simply kept the default from github both times.
I see other pools too have the global hashrate in error, but only slightly. It seems they use 180s instead of the correct 175s for the estimate.
To all pool operators: Use 175s as block time to get correct global hashrate estimates.
Yes! Already did it since weeks. For quick copy/pasters (no offense, no conspiracy) search for 175 in the source of the main page of my pool.
And global hashrate is in the top of the wallet too.