The units reported for Linux sensors for disk/%s/Delta/rtim and disk/%s/Delta/wtim are incorrectly reported as s (seconds). These should be ms (milliseconds).
A pull request with a fix has been submitted via KDE Gitlab.
Is there something else I need to do to have the pull request merged?
ksysguard is no longer maintained, in Plasma 6 there is the Plasma system monitor for this task. If your issue still happens with the Plasma 6 replacement, please re-open and we can move this bug to the new product, thanks!