Not sure what you mean but here is some info that I found. I hope it helps "NXXT is a type of 'crossing' or 'crossed trade' (known as an NBBO Crossing) that your broker (CommSec) reports to the ASX. A 'crossing' or 'crossed trade' is when a trade has resulted from matching a buyer and a seller of a particular stock, and the buyer and seller are clients of the same" The number you mentioned eventually changed before trading session begin.
MLX Price at posting:
20.5¢ Sentiment: Buy Disclosure: Held
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(20min delay)