Back dated payments

Hi, I have been awarded PIP for months now and have just been moved to the ESA Support group. I have been in the ESA newstyle group since may 2022, this was because I was off sick and had needed to provide doctors fit notes. My ESA was agreed and I received the backdated amount since may 2022. I have now joined the ESA support group and have been given a back dated payment but only from August 2022 and I don't know why it's not back dated from the original date in May. Any idea? Thanks

Traceyh66

New claims for ESA include a three month Assessment Period, so your Support Group award will be payable from the beginning of week 14 of your claim which would seem to be consistent with the August date.

Gordon