Contouring bug in AreaFill mode

Hi,

I have a bug when using cnFillMode = "AreaFill" for a simple contour
plot (gsn_csm_hov).
2 things happen: 1. Contour intervals are randomly absent and 2. Contour
intervals are missed on their way to max and mins.
The plot attached shows the problem. The left is with AreaFIll and the
right is with RasterFill which seems accurate.
I am using ncl version
    /glade/u/apps/opt/ncl/6.2.1/gnu/4.4.6/bin/ncl
And on yellowstone (yslogin6)
My script is attached and it points to glade data.

Many thanks!
Rich

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