You should be able to reproduce this problem only in IE6 and IE7. It is a result of a browser bug that is fixed in IE8. Basically, the problem is with relatively positioned elements in scrollable elements and the solution is to apply position to the scrollable parent element as well. Please refer to our RadSplitter integration with relatively positioned elements
knowledge base article for additional information.
You can use tools as IE Developer Toolbar for IE and Firebug for FF to check which the scrollable parent of the sliders is and how to apply position to that element. In case you need help with that, please open a new support ticket and send me a running test project that demonstrates the problem and I will do that for you.
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