PIP award extended 3 years?

Hi, my PIP was due to be reviewed by May this year but had heard nothing, I assumed because of the backlog. I needed my Blue Badge renewed and expected just 3 months before expiry on new badge. I went to council hub in library to renew badge but when they accessed my PIP records it had been extended in November for 3 years! New date being Nov 2028. I know awards have sometimes been extended up to a year due to backlog but 3 years was a surprise. I have not heard anything. Have they gone by previous review form? Last review was for 5 years and they told me on phone they would have given ongoing except they know my condition could deteriorate. I had also highlighted sentence from neuro where he said my symptoms would be ongoing. My disability rights advisor said he's had a couple of people contact him with same thing? Have they gone by my previous review information? Thanks.