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you mean you need the spice model of the cap? What size is the cap?
I have had similar problems trying to model shunt caps as lumped elements in filter structures, though I have occasionally had success. From my understanding, the RLC boundary should have the integration line flowing From the lower potential(gnd) Towards the higher potential (trace), but I think that adjusting the width of the sheet will affect the outcome of the simulation. You could try using a narrower sheet. Let me know how it turns out.