So just how do E.On Next estimate my future usage to calculate my annual usage? Also, how do they actually calculate the reduction on the price cap for the Next Pledge Tracker tariff?

Based on my bills, from Sept 2023 to August 2024 I have used 7491 kWh of Gas and 2756 kWh of Electricity, however as of my most recent bill, in August, E.On Next estimate 8217 kWh Gas and 3298 kWh Electricity, both a bit higher than my current usage, but not excessively so, both about 10% high.

However, the email I have received for my new rates from October (I'm on the Next Pledge Tracker v5), and now showing online estimate my gas usage to be 8179 kWh, but the electricity usage to be 10,009 kWh per annum😮 This is over 3.5 times my actual electricity usage in the past year. How on earth do they get that figure? Any ideas?