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LMZ20502: Strange Phenomenon

Part Number: LMZ20502

Dear sir or madam 

I have a problem with LMZ20502  in my board. The schematic is below.



While , After 3.3V powered up  and chip enabled  , I could see the 1.8V output from a multimeter  in a very short time  , and then it turned to 1.5V . And the load couldn't work well in this voltage .

If I inserted a multimeter in  current  instead of  two beads .  Then , It could work well as 1.8V . As I saw , The current to the load is about 1.3A . 

I am confused about this phenomenon . 

Can you give me some advice ?

Thank you in advance.