If it's the same as ASB "The charts in our share trading platform are gross adjusted. They take into account dividends paid and the historical data is adjusted."
When I complained to the FMA that gross adjusted short term charts were grossly misleading eg Not showing a drop in pricing when going ex dividend - they forced ASB to provide unadjusted options on the short term charts eg same as the NZX charts for time periods under a month, and fixed their software & documentation.