Here are a few things that could be causing the problem:
- Hound only comments when style violations are found. Ensure that changes made in your pull request actually contain style guide violations.
- Ensure that configuration is setup to report on the specific violations. See the configuration page for more info.
- Be sure your PR is of a manageable size. The Github API has access limits which can affect the number of violations reported. Anecdotally, we've seen pull requests with more than 250 changed files get incomplete responses.