You are using timeZone: "Americas/SaoPaulo", but that is incorrect and gives an error as this timezone is not supported by Moment.
Instead use: timeZone: "America/Sao_Paulo"
You define timeZone for timeAxis. That means that there is offset given to timeAxis and not the data.
You have to also update your contentsFunction new Date objects to return date with corresponding offset.
Or maybe you want to use
timeZone: "local" .
Here you will find more information about time zones: