If any further information or assistance is needed, do not hesitate to contact me and the team.
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Could you please double-check if the browser is not zoomed? Furthermore, is there some custom CSS applied?
The fastest route to getting you up and running is if you could provide a runnable, isolated, sample project. Examining this project will let us replicate the issue locally and further troubleshoot it. A member of the developers' team who is a Kendo UI Scheduler expert is already involved and once we have a runnable example locally, will confirm if it is a bug, a workaround for it and I will increase your Telerik points accoringly.