Hi Martin,
We regret for the inconvenience caused.
We can able to reproduce the reported issue, hence we have logged bug report as “Baseline StartDate/EndDate value varies on cell editing and dialog editing event arguments”.
And also we have created a support incident under your account to track the status of this issue.
Please log on to our support website to check for further updates.
Please let us know if you require further assistance on this.
Regards,
Suriyaprasanth R.