So there is loads of speculation that the CXXT trades are part of a conspiracy to keep the share price down.
What does CX or CXXT mean in course of sales?
CX is a trade that has occurred in ASX CentrePoint at the current midpoint price. The midpoint price is determined by ASX to be the midpoint between the current ASX bid/offer spread. CXXT is a cross trade or crossing that has occurred in ASX CentrePoint at the current midpoint price.
Source: Comsec FAQ's
I did a little research and it appears that not many brokers offer the centre-point option.
So the reason that the trade gets a CX at the front is because that it was traded through ASX centrepoint and the XT means it was a cross trade, which means the trade was through the same broker. Here is more info on ASX centrepoint.