Queries about AD10200

Question

Dear Supporter, 
 I used AD10200 in my project. I tested AD10200 with signal generator. The sampling clock is 105MHz. FFT N=65536. 
 When I input 10MHz sine wave, the FFT result looks good. Please see below pic. 
 
 but when I input 41MHz, 71MHz or 105MHz respectively, the results look poor, please see below pics.

I am not sure why the waves are abnormal. Could you please help give me some comments on the issues? 
 Thanks in advance for your help! 
 Br, 
 Wayne

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Queries about AD10200