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Thanks you so much ! So it seems I do not use port correctly...

I would do the same as Polar, that is to say use the out wires as reference (GND) for each of the internal signal wire

Can you please explain me what is wrong in the way I use the port... ? Here is how I do :

Using wave port, I use the internal two wires as terminal and out wires as reference for these terminals :

[ATTACH=full]195047[/ATTACH]

[ATTACH=full]195048[/ATTACH]

And after that, I construct my differential pair using the two internal wire (+ sig / - sig):

[ATTACH=full]195051[/ATTACH]

Using lumped port, I also use external wires as reference. Here is example for + signal of the differential pair (I do the same way for the neg signal, with reference to the other wire at left) :

[ATTACH=full]195049[/ATTACH]

And internal wire as terminal :

[ATTACH=full]195050[/ATTACH]

And after that, I construct my differential pair using the two internal wire (+ sig / - sig), same way as modal port.