[Bug][Scheduler] Group headers are misaligned and events overlap when they have the same start date and time

[Yanko-Georgiev]

Description

Group headers are misaligned, and events overlap when they have the same start date and time. Clicking an event fixes the layout. Also, setting a different start time for the events with even one millisecond difference fixes the layout.

Plan

KendoReact

Steps To Reproduce

1. Open the following example: https://stackblitz.com/edit/react-dxcdq8yq-i4snwtvu?file=app%2Fapp.tsx
2. Navigate one date back (to 8 October 2025)
3. Notice the events are misplaced and the grouping headers are misaligned
4. Click on the events
5. Notice the layout jumps to the expected state

Screenshots or video

No response

Actual Behavior

Group headers are misaligned, and events overlap.

Expected Behavior

The group headers should be correctly positioned based on the events that are supposed to be displayed, and the events should be displayed one after the other and should not overlap.

Last working version of the KendoReact package (if regression).

9.1.0

Reported in TicketID: 1700639