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LM5161-Q1: EMI Issue

Part Number: LM5161-Q1
Other Parts Discussed in Thread: LM5161

Hi  Experts: 

            My customer is testing their board with the EMI specification , in the RE test, they found the harmonic frequency 55Mhz, 66Mhz, 77Mhz,88Mhz, which is derived from the 11Mhz fundamental wave. Please see the result below: 

            i just want to make sure whether there is 11Mhz clock inside of the LM5161 ?