non cyclic data not aligning in longitude

Hi,
I've attached a plot to illustrate problem. I've read in the observed set (panel a) which does not cover the entire the globe (unlike b,c,d) but I cannot get the fills to align over Australia. I've ensured that the dimensions are named and coordinates point to the dimensions and have units. Any idea? I will be restricted the domain to plot over Australia, but for now the global extent makes it clear.
Regards,
Mark.

CSIRO Marine and Atmospheric Research
Australia.

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