I tried to reproduce the problem with the provided information but to no avail. Could you please provide more detailed information on the specific issue? If possible, please open a support ticket and provide a sample project that reproduces the problem.
For your convenience I have attached my sample test project, could you please modify it to a point where the problem occurs and send it back so we can investigate it further?
On a side note, please make sure that all of RadSplitter parent elements have set height value.
All the best,
the Telerik team
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