I can reproduce the change in current pattern while scanning the phase. I think it's normal. S-parameters are expected to change with the different phase sgift in Latice pairs. Big change means stronge coupling between the dipoles in the array; field distribution is expected to change. The current distribution is no exception. If you move dipoles in the array further apart (increasing the size of the Unit Cell), you will decrease the coupling and should see smaller changes in field distribution.
In general, why are you looking at current distribution? What is the goal of simulations to begin with? Is the solution you get from HFSS doesn't align with your prediction/expectations?
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