inputh history graph dont match (24 h and 12 h)

[guga.melro]

its quite odd, on the premium graphs of input history, the "last 12 hours" dont match with the "last 24 hours"
for example:
the hour 9 on the last 12 hours graph shows clicks:420 and key:822
on the other hand, when i switch to the last 24 hours graph the hour 9 shows clicks:347 and keys 1019 when they should be the same.
but on the hour 11 both graphs show the exact same count .

whatpulse version:2.6.3
win8 professional