APX Charts, page-511

Can someone shed light on the interesting discrepancy between Shortman and ASX daily short data? I understand that the data on Shortman has a lag of 4 trading days, but it still cannot explain the following phenomenon.

I have been tracking the ASX daily short data for several weeks. Since March 5th, both APX and BRN have consistently shown 0% short sold, while ZIP has hovered around 0.1% to 0.2% capital shorted. However, upon reviewing the Shortman chart during this period, the aggregated short sales of APX and BRN increased, while ZIP decreased dramatically.The decrease in ZIP short sales can be explained by short covering exceeding new shorts. However, for APX and BRN, how can aggregated shorts increase when there are 0% new shorts for this period?Your insights on this matter would be greatly appreciated