From the screenshots I can infer that the zooming is working as expected. The zooming is done both on vertical and horizontal scale and that is why the range for both vertical and horizontal axis has changed. I suppose you want to zoom on horizontal scale only. To do so you have to set the zoom mode to horizontal. Here is the online documentation
on the topic. I hope this is what you need. In case it is not, can you please start a support thread where you are providing a sample project and more details about the issue.
the Telerik team
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