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DC2844A/ LTM4680 two phase load current sharing


I am testing LTM4680 demo board DC2844A in a interleaved two phase buck operation, but I noticed significant current imbalance according to the telmetry reading. Here is what I did:

1. I followed the schematic instruction to short some signals. 

2. I changed both VOUT_COMMAND to 1.8V.  

But it does not ensure currenet sharing (at no load, I can see one phase curent is negative! ) . I want to know what else do I need to do to ensure current sharing.