If you manually added this https://www.hershandhurd.com/sitemap.xml first line in the robots.txt file from the site settings, you should remove it. Webflow automatically appends the correct syntax and path to that file. That first line is not formatted in the correct syntax.
While the robot should ignore it, no guarantees that it won’t cause an issue.
The file is visible and Google has indexed all the pages listed in the sitemap.