Drawing stability circles in ADS

when i try to draw the stabilty circles for my amplifier,all of the circles in the frequeny range lie intirely inside the smith chart..this means that my amplifier is potentially unstable while i am soo sure that the amplier is unconditionaly stable and i cheked that by calculating the K stability factor and finding it larger than 1,
this means that the circles r supossed to be totally outside the smith chart.
does anyone knows what seems to be the problem