Ok next question how often do you make a payment to Eon Next? Every month or every 3 months? POBR (Payment on Receipt of Bill) or via DD?
The next thing I would do is have a look at your online account and hunt out all the statements referenced in that 4th section and get them downloaded as they may reveal what is going on with your electricity account - they should show you exactly how Eon Next arrived at the numbers in these reversed charges and might make things a little clearer for us all. It is odd that some months had multiple statements on the 11th of each month (eg April 2023) which makes me wonder if you have some complex metering arrangements (Economy 7 etc) and/or whether you had a new meter put in earlier in 2023 and somehow Eon Next thought that 2 meters were still active (one old meter and the new smart).