If you are using the same code there should be no issues, since the tooltips are added in the ItemDataBound event of the RadGrid, which is fired for all rows. In case you have modified the logic that adds the target controls to the tooltip manager please make sure that your loop does not end at the 10th element. What I would advise is that you start a clean page and copy the code as it is in the demo then start building your functionality from there. This way you can easily isolate which modification causes the issue.
You can find attached a test page that I tried in the LiveDemos solution's root (needs to be in the root for the paths to be correct, otherwise simply modify them). I stripped the dependencies from the demo site, leaving only the datasource, as it is essential to the functionality. It seems to be working correctly on my end: http://screencast.com/t/JTlE3UBe
. Please compare it with yours and try to locate any major differences.
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