I've attached a sample project where the Gantt widget is displayed. Run it on your end and see if it's working or if the issue is still reproduced.
Also in the project I selected YearView, but hidden the top row, so that only months are shown, as per your requirement. Please note that I chose to hide the top row instead of the bottom one, since the columns in the timeline are aligned to the bottom row of headers, and hiding the bottom one will produce misaligned results.
You just have to put in the Kendo.Mvc dll in the project in order to test it.