This behavior is not reproduced in the ChartControl for WindowsForms.
Attachment is a MVC, ASP and WindowsForms sample projects.
To resolve the issue do not set the AutoGrid property. When you set the GridSpacing property the AutoGrid property will be disabled automatically.
We have fixed the issue described in this ticket and will include the fix in our next maintenance update. To apply this solution before the official update, request a hotfix by clicking the corresponding link for product versions you require.
Note: Hotfixes may be unavailable for beta versions and updates that are about to be released.
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