Hi,

I've notice an issue with Scheduler: the height for group slot is not correct calculated and items goes down to the next group slot.

Scheduler :

   - group vertical after a field

   - type of scheduler: "timelineWeek" or "timelineMonth"

   - items of the group have same start date and their number are bigger then 20.  

kendo ui version: 2020.1.219. Same issue with 2021.1.119

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I've created a dojo as example:  https://dojo.telerik.com/EHeNigIQ  .   Also, you can see the issue into the picture bellow.

You can modify the variable  "rows = 30;"  and you will see more items that goes wrong into the other group slot.