Outstanding balance

On the 23rd 24th Dec 2019and so on I made purchases on my debit cards. Today is the 27th and whilst browsing through the std bank app at my cheque account as I wanted to check my balance. I discovered that there is "outstanding card authorisations" which I now believe that the outstanding balance is not reflecting as correct because money's spent is not taken out from the balance that is showing. You then have a false sense of how much u can spend. Is this deliberate or is this app a waste of downloading as it seems not to be updating on time. I also noted that the balance on the sms differs from the balance on the app.