Read the article in post 164.
The R(t) rate starts climbing midway though the stay at home period, and then starts falling again around June 10th. It continues its downward slope through the 18th when masks were made mandatory, and then levels off around July 4th.
Given the larger base of infected people an R(t) even slightly greater than 1 results in continued growth of cases.
Clearly external factors influence the rate of reproduction for the virus, but they don't appear to be the simple factors cited by politicians, pundits, and the media.
In some cases multiple factors may come into play. Keeping everyone home may have caused more transmission at home among family members and less between strangers. And then those newly ill people went out for treatment, or to get groceries, or to have a drink at the bar.