ADF5902 Wandering noise


ALL,We use adf5902 and adf5904 in our design ,During the test,

1.we found that the rf output tx of adf5902 has Wandering noise,The following video shows 

2.Adf 5902 operates in sweep mode,Vtune also has a Wandering noise,as follows


My question 

How to optimize the above two problems ?