Why do I get two peak after T-matching section for input matching in LNA?

i have used T-matching section for input matching in LNA...and i get this kind of response....question is-......why do i get this two peak.....what could be the reason for this....can anyone explain it for me ...please ?

still no help ?

Why don't you try plotting it on a polar or smith chart plot and the answer will be a little more obvious!