This is 100% expected... think about this:
"Reviews of past studies have found that the flu vaccine is about
50% to 60% effective for healthy adults who are between 18 and 64 years old. The vaccine may sometimes be less effective. Even when the vaccine doesn't completely prevent the flu, it may lessen the severity of your illness, and reduce the risk of serious complications and serious illness requiring hospitalization."
(
https://www.mayoclinic.org/diseases-conditions/flu/in-depth/flu-shots/art-20048000)
If you thought the Covid vaccine was capable of making someone incapable of spreading you're missing the point altogether. It's about reducing the the spread and symptoms as much as possible.
Also of course the virus is going to offer better immunity... but that comes with a cost.
