git svn pointing at svn branch instead of trunk?

When I used git svn to clone a repository, it ended up pointing master at a tag in svn instead of trunk. For example, git svn info shows the URL for the tag instead of trunk. git log master also shows the most recent commit is the creation of that tag in svn, but then the next commit is the most recent commit to trunk. It's like it's mixing things from the tag with things from trunk. The most recent commit in svn was to create the tag that master is now pointing to in case that matters.

Is there something in the svn repository that might cause this? What's the correct way to reset what git svn thinks master should point to? And how should I get rid of the commit on master that created the tag without messing up git svn (e.g. can I just git reset or will that confuse git svn later?).