Why one more legend appears in my figure

Dear all,

When I used gsn_csm_xy3 command to plot a figure and put legends on
the figure, I found there are four legends on my figure.
Please see the figure.

Here is the script I used:

   res11_at_pmLegendDisplayMode = "Always" ; turn on legend
   res11_at_pmLegendZone = 0
   res11_at_pmLegendSide = "Top" ; Change
location of
   res11_at_lgJustification = "BottomRight"
   res11_at_pmLegendOrthogonalPosF = 0.35 ; more neg = down
   res11_at_pmLegendParallelPosF = 0.15
   res11_at_pmLegendWidthF = 0.08 ; Change
width and
   res11_at_pmLegendHeightF = 0.04 ; height of
legend.
   res11_at_lgLabelFontHeightF = .008 ; change
font height
   res11_at_lgPerimOn = False ; no box around
   res11_at_xyExplicitLegendLabels = (/" SST gradient"/)

   res12_at_pmLegendDisplayMode = "Always" ; turn on legend
   res12_at_pmLegendZone = 0
   res12_at_pmLegendSide = "Top" ; Change
location of
   res12_at_lgJustification = "BottomRight"
   res12_at_pmLegendOrthogonalPosF = 0.35 ; more neg = down
   res12_at_pmLegendParallelPosF = 0.35
   res12_at_pmLegendWidthF = 0.08 ; Change
width and
   res12_at_pmLegendHeightF = 0.04 ; height of
legend.
   res12_at_lgLabelFontHeightF = .008 ; change
font height
   res12_at_lgPerimOn = False ; no box around
   res12_at_xyExplicitLegendLabels = (/" wavelet variance"/)

   res13_at_pmLegendDisplayMode = "Always" ; turn on legend
   res13_at_pmLegendZone = 0
   res13_at_pmLegendSide = "Top" ; Change
location of
   res13_at_lgJustification = "BottomRight"
   res13_at_pmLegendOrthogonalPosF = 0.25 ; more neg = down
   res13_at_pmLegendParallelPosF = 0.35
   res13_at_pmLegendWidthF = 0.08 ; Change
width and
   res13_at_pmLegendHeightF = 0.04 ; height of
legend.
   res13_at_lgLabelFontHeightF = .008 ; change
font height
   res13_at_lgPerimOn = False ; no box around
   res13_at_xyExplicitLegendLabels = (/" precession"/)

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