Who knows, everyday it's a different story. At first it was your immune, then it was you can still catch it and spread it but you will be asymptomatic. Now today I see in England 40% of hospitalizations are people who are vaccinated.
Looks to me that you misread the statistic; the story I saw said "cases in vaccinated people rose by
40%." which can be a very small percentage of total number of people hospitalized. Note that those with only 1 dose of the 2 dose vaccines are included in the vaccinated category.
For example if you have a bag of 1000 marbles and 990 of them are red and 10 are blue and you put another 4 blue ones in the bag, the percentage increase of blue is 40%; but there still is a very small percentage of blue out of the total.
Getting back to COVID:
According to figures from
Public Health England (PHE), one dose of AstraZeneca or Pfizer vaccine reduced the risk of catching mild symptoms of COVID-19 by 35%.
However, even one dose of vaccine protects against the more severe risk of COVID-19, reducing the risk of hospitalization by 80%.
Two doses of vaccine were much more protective, reducing the risk of having mild symptoms of the disease by about 80%, and the risk of hospitalization by 96%,