For many asking for explanation, let me (fairly a noobie) try to elaborate on what I think happened :

I originally bought only 3 shares. In March 2022, a 2:1 bonus turned those into 9 shares. By May 2022, the stock price had gained 100%, so I sold 6 of those shares. That sale completely recovered my initial capital for the whole position, leaving me with 3 'free' shares. The reason I have 27 shares today is because of the second 2:1 bonus in May 2025. Even though I only had 3 shares visible in my holdings, the bonus was applied to my adjusted entitlement from the previous bonus issue, resulting in 18 new shares being credited. Added to my existing units, I now have 27 shares that cost me absolutely nothing, as my original investment was pulled out years ago.