Looker Studio: Do data credentials update themselves?

This week the Data Credentials have changed on their own in 2 of my Looker Studio reports.
Leaving the client unable to access the dashboards without prior notice.

I always configure them with Owner's credentials and use an account that has access to the BigQuery from which I extract the data with all the necessary permissions.
However, it sometimes autoconfigures itself to Viewer's Credentials.
And it's not the first time it's happened to me. I've been looking for information about it, but I haven't found anything,
Am I doing it the wrong way? Does anybody know what is it due to?
I would really appreciate some clarity on the matter, thank you very much in advance!