Given the documentation of the extension you are using (https://marketplace.visualstudio.com/items?itemName=ryanstedman.tfs-pullrequest-dashboard) it says that it displays all the statuses that have been set during the life cycle of the Pull Request, so basically each time that a build is triggered with a fix or anything else, something is written as a status, and then displayed (and for us, the quality gate is evaluated during each build if SonarCloud is configured, and more specifically the quality gate status is reported in the PR if selected as a branch policy).
We can’t unfortunately control the behavior of this plugin, as for us, we only display quality gate status in the built-in Pull request summary page.