If you spend more of your income on food and energy bills, then - and especially with energy bills going up, your personal inflation rate is going to be much higher than the headline rate.
Mine is 25% apparently. That's driven by petrol costs and energy costs.
www.ons.gov.uk/visualisations/dvc1833/calculator/index.html
If you have more money, then you are likely to be able to buy a wider 'basket' of goods so you are more likely to be closer to the average inflation rate.