Summary vs Committed Spending

I love using my Monzo to work out how much spare money I have compared to my committed money. I do have to keep an eye on it though as sometimes it gets out of sync and my account balance ends up being less than what my summary is showing. I think this is because some of my direct debits are dynamic and can change month to month, like a mobile phone bill. The summary/committed spending does not account for changing amounts and therefore throws the summary out.