plot of valid time

Hello,

When I plot WRF output data, everything looks ok except the valid time. The sample image is shown in the attachment. The settings are shown in the following. Do you know why it is wrong? Thanks!

-Longtao

***************************************************
 res = True
  res@MainTitle = "REAL-TIME WRF-chem"
  res@Footer = False

  pltres = True
  mpres = True
  mpres@mpGeophysicalLineColor = "Black"
  mpres@mpNationalLineColor = "Black"
  mpres@mpUSStateLineColor = "Black"
  mpres@mpGridLineColor = "Black"
  mpres@mpLimbLineColor = "Black"
  mpres@mpPerimLineColor = "Black"
  mpres@mpGeophysicalLineThicknessF = 2.0
  mpres@mpGridLineThicknessF = 2.0
  mpres@mpLimbLineThicknessF = 2.0
  mpres@mpNationalLineThicknessF = 2.0
  mpres@mpUSStateLineThicknessF = 2.0

  gsn_define_colormap(wks,"rainbow")
 

 opts = res
  opts@FieldTitle = var
  opts@cnFillOn = True
  opts@InitTime = False
  opts@ValidTime = True
  opts@TimePos="Left"
  opts@TimeLabel=times(it)
  opts@ContourParameters = (/ 70., 100., 1./)
  contour_co = wrf_contour(a,wks,co_plane,opts)
  delete(opts)
  plot = wrf_map_overlays(a,wks,(/contour_co/),pltres,mpres)
***********************************************************
                                               
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