problem with conservative form of two phase flow phase field

Hi every body, I'm simulating droplet formation in COMSOL 5.3a using two phase flow,phase field. when i use non-conservative form the droplets form and move in the microchannel, but when i switch to conservative form, it give the illogical results, some droplets form befor the T-junction!!! is there anyone who could help me? regards, Farhad