STATE PENSION

I am totally confused about the above. I thought I was on track but just found out I'm not. I am 64 at the moment, the usual story of not getting pension when I was 60. However this morning I have just found out that although I have 42 years worth of NI contributions and thought eventually when I get my pension in July of next year I would get the full new state pension. OH NO not so. I've just been on the website and they inform me that to qualify for the full new pension I would have to contribute towards the years from 2011(when I retired) up until 2019. At the time retiring I did have enough years to qualify. On another government website it clearly states to qualify for the new pension you have have to 35 years worth of contributions which I have. I am totally confused. Is there anyone out there who could advise?