This could happen in some scenarios because of the way RadFormDecorator styles checkboxes. When RadFormDecorator is used, the real checkboxes are hidden outside of the viewport. When the decorated checkbox is clicked however, browsers try to focus the real checkbox, hence the "jumping". To avoid that, you should set position:relative
to the parent container.
If you still experience problems after that, I strongly recommend to open a support ticket and to send us a small sample page where this issue could be reproduced. This way we could get a better view over your setup and provide you with the most appropriate solution for it.
All the best,
the Telerik team
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