As above, the ASX website data is delayed by 20 minutes, other providers might take another 10 minutes to distribute non live data.
Further, there's the 2* exchanges,- so there's ASX data and Chi-X data.
I guess it's possible that changes are incorporating both exchanges data.
I've noticed that Comsecc give live combined data on the main page of a stock. If one goes into an order page, it will only display ASX market depth though.
Your question is probably best to name your broker here though and someone might know specifics for that broker, or enquire directly to your broker.
I can't say about candles changing though, but if there's that much change to a candle, it suggests low volume volatility and wide market depth.
* Actually 3 exchanges now including NSX, but I think they might be struggling to get a foothold and probably not worth including here for confusion purposes.