Fix statistics, won't show in GUI

I’ve got a value in my statistics that I want to fix. If I query the database, I see the record where it goes wrong:

At the third row I expect a value of 1296.322 in the column sum. When trying to change it through the fix statistiscs screen I cannot see this value:

image

For some reason it won’t show the 14:00 datapoint.
Has anybody an idea how to fix this datapoint?
It is currently messing up my graphs and contaminating my totals :frowning:

I concur to have the same issue
I updated statistics a few months ago and there it was OK, this time…