This problem is not reproducible at our side. I see from the attached image that you've made some customization on RadScheduleView. To give you with more detailed instructions I suggest you send us sample running project to illustrate the issue so we can test it locally.
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for WPF.
Learn what features your users use (or don't use) in your application. Know your audience. Target it better. Develop wisely.
Sign up for Free application insights >>