Schematic with 6 coupled inductors showing bug

test_6_inds.sch

<Qucs Schematic 0.0.19>
<Properties>
  <View=-10,30,873,980,1.02945,0,0>
  <Grid=10,10,1>
  <DataSet=test_6_inds.dat>
  <DataDisplay=test_6_inds.dpl>
  <OpenDisplay=0>
  <Script=test_6_inds.m>
  <RunScript=0>
  <showFrame=0>
  <FrameText0=Title>
  <FrameText1=Drawn By:>
  <FrameText2=Date:>
  <FrameText3=Revision:>
</Properties>
<Symbol>
</Symbol>
<Components>
  <GND * 1 200 300 0 0 0 0>
  <R R1 1 130 160 -26 -55 1 0 "50 Ohm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "US" 0>
  <Vac V1 1 70 230 18 -26 0 1 "1 V" 1 "1 kHz" 1 "0" 0 "0" 0>
  <R R6 1 340 230 15 -26 0 1 "50 Ohm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "US" 0>
  <R R5 1 440 230 15 -26 0 1 "50 Ohm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "US" 0>
  <R R2 1 540 230 15 -26 0 1 "50 Ohm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "US" 0>
  <R R3 1 640 230 15 -26 0 1 "50 Ohm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "US" 0>
  <R R4 1 740 230 15 -26 0 1 "50 Ohm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "US" 0>
  <.TR TR1 1 40 370 0 71 0 0 "lin" 1 "0" 1 "5 ms" 1 "101" 0 "Trapezoidal" 0 "2" 0 "1 ns" 0 "1e-16" 0 "150" 0 "0.001" 0 "1 pA" 0 "1 uV" 0 "26.85" 0 "1e-3" 0 "1e-6" 0 "1" 0 "CroutLU" 0 "no" 0 "yes" 0 "0" 0>
  <MUTX Tr1 1 250 230 -21 67 0 0 "6" 1 "1 mH" 1 "1 mH" 1 "1 mH" 1 "1 mH" 1 "1 mH" 1 "1 mH" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1 "0.9" 1>
</Components>
<Wires>
  <200 280 200 300 "" 0 0 0 "">
  <200 280 220 280 "" 0 0 0 "">
  <220 280 240 280 "" 0 0 0 "">
  <240 280 260 280 "" 0 0 0 "">
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  <200 260 200 280 "" 0 0 0 "">
  <160 160 200 160 "" 0 0 0 "">
  <200 160 200 200 "" 0 0 0 "">
  <440 200 440 200 "L5" 480 160 0 "">
  <740 100 740 100 "L2" 780 90 0 "">
  <640 120 640 120 "L3" 670 110 0 "">
  <540 140 540 140 "L4" 570 130 0 "">
  <340 180 340 180 "L6" 380 170 0 "">
  <200 160 200 160 "L1" 190 90 0 "">
</Wires>
<Diagrams>
  <Rect 530 530 240 160 3 #c0c0c0 1 00 1 0 0.001 0.005 1 -0.124336 0.1 0.124002 1 -1 1 1 315 0 225 "" "" "">
	<"L1.Vt" #0000ff 0 3 0 0 0>
	<"L2.Vt" #ff0000 0 3 0 0 0>
	<"L3.Vt" #ff00ff 0 3 0 0 0>
	<"L4.Vt" #00ff00 0 3 0 0 0>
	<"L5.Vt" #00ffff 0 3 0 0 0>
	<"L6.Vt" #ffff00 0 3 0 0 0>
  </Rect>
</Diagrams>
<Paintings>
</Paintings>