Hi,

this problem can't be direct related to JSitemap, because the content data source generate links for native Joomla articles thus using the native and core Joomla router for articles. It turns that there have been some updates not in JSitemap but in Joomla (probably 3.7 bug) maybe combined with your plugin Direct Alias Pro that generates this issue.

Try to investigate and find out more details, there is nothing to do on JSitemap side it uses the standard Joomla code, when you get 'component/content' in URLs it means that the Joomla router fails.
https://storejextensions.org/faq/does-jsitemap-generate-urls-or-is-responsible-for-that.html