AD9837 amplitude error during phase changement

Hello all, 

I still don't understand the amplitude of my signal but it's in an ohter post.

now I'm facing an other issue. after each phase change, I have a over amplitude on the signal. 

the signal is take just at the ouput of the DDS.

I fallow the recommandation I think .

May I miss something? 

I already use a AD9834 and don't have this.