Ooof.... no good short answer for that. Recently, there was talk of running tests with lower cycles on vaccinated and higher cycle tests on unvaccinated which could make it appear that the unvaccinated are contracting COVID at a higher rate but the cycle count is playing a factor there.
Also, when Uncle Sam started paying hospitals for COVID cases, it incentivized positive cases.
Some pro-vaxxer is now likely to come along and flame me for those comments so....LET'S GO!!!
I had posted a news story awhile back where a whistleblower said the hospitals were being bribed to say how great the vaccinations are.