I am not able to reproduce this behavior with your version (or with the latest). You can find my test page and a screenshot showing the rendered HTML
Does this issue happen only under certain browsers or browser versions? If you upgrade to the latest version can you still reproduce it?
So far we have not been able to see this behavior, so please open a support ticket and send us a sample project that displays it so we can examine it on our end.
For the time being if the issue persists you could add, for example, a hidden field in the content template, or add the text as a literal control or label if this works for you. Please accept my apologies for any inconvenience caused.
the Telerik team