You can reproduce this by changing input language to any region that uses a comma decimal separator (e.g. Duetsch). The comma is ignored, ultimately corrupting the data
I've set the status of this item to "Approved" as it is a valid bug report. As you're following the item, you will receive an update as soon as there's any progress on it.
I've also updated your Telerik points as a small sign of gratitude for reporting the issue to us.
I am sorry for any inconvenience caused.