Testing releases show up in production

Hi there. We have installed Sentry on-premise about a week ago, and it works great. However, a couple days ago we started properly tagging our releases by their environments, and it seems like there is either a bug or something we did wrong. Even though during release (we do our releases via sentry-webpack-plugin) we tag our deploy.env with the correct environment, the releases we tag with the testing environment show up under production in the Releases tab:

What I expected to happen was that only releases that have the environment production would be displayed under that tag. Are we missing something? Thanks in advance!