The actually-traded low price of the day for ASX:PDN was 0.035. PDN traded at various times from 12:04:08 through 15:05:27 for a total of 26 trades at this price. Source: ASX Reference Point Course-of-sales feed.
The raw (daily) data for PDN on 2020-03-23 is:
What you are seeing is the effect of price adjustment(s), which are applied to normalise the impact of corporate actions on pricing data.
Since that date, there has been a corporate action relating to public capital raising, namely a 2:17 Non-renouncable issue of shares @ 0.37 on an accelerated basis (called JUMBO) with ex-date 2021-03-19. The ASX assessed that this corporate action had a dilution factor of 0.9785. Source: ASX Reference Point Corporate Actions and Dilution factors feed.
So, the adjusted daily data for PDN on 2020-03-23 becomes:
Different places round and store data in various ways, to make it visually pleasing on a chart or tabular form. For backtesting you really do want to ensure that the rounding is minimal and, if you are simulating actual tick sizes, you probably need the ability to access raw data at the same time too.
An extreme example worth noting is taken from a Nasdaq-listed stock, TOPS (Top Ships). This stock has had so many reverse splits (consolidations) that its adjusted high price is $2410208811265.394 - yes, that's over 2410 BILLION dollars. At the time, its actual trading high was 24.14 on 2004-11-29.
The highest price in our ASX database back to 1992, on an adjusted basis database, was for Brisconnections (since delisted) showing $790393.8146 on 2008-07-31 due mainly of the effect of adjustments for calls on partly paid securities, and the second highest is for ASX:SEQ (Sequoia Financial Group) with an adjusted high of 538982.8259510773 on 2000-11-20, due to the effect of multiple consolidations (reverse splits) and a few capital raisings in between.
Adjustments like these seem a little strange, but other "normal" events such as stocks splits, you'd certainly argue that they are necessary to discount the effect of capital base changes (and, optionally distributions such as dividends) to provide a meaningful set of historical prices in the context of the current price.
Full disclsoure: I am a co-owner of Norgate Data, a data vendor for Australian (and other markets) data, providing survivorship bias-free data with the ability to customise the price/volume adjustment methods. We obtain data directly from the ASX's direct price and corporate actions feeds.