Bloomberg mystery

Can anyone who is using Bloomberg tell me why the historical AUD/USD exchange rates on 26 March and 20 March are different? The only difference between the two screenshots below are the date of the screen generation - one on 26 March and the other on 27 March. Both are from the same source (NY). The impact of using these rates can be quite serious for a multi billion dollar fund. I've never used Bloomberg before and these screenshots are provided to me from colleagues from AIG (AIA) Malaysia and Hong Kong respectively.

Click to view the whole screenshot

Click to view the whole screenshot