I'm using this module on different websites but this is the first time I have this kind of problem.
When I open sitemap url website redirects me to homepage and only after I resubmit the sitemap url the page with sitemap is opened.
After I clear the cache (in my browser) and try again, the situation is the same, first time it redirects me to homepage and only second time it gives me sitemap page.
On the same hosting I have other drupal webistes with same httaccess files. I'm not sure whats the problem but with website that has sitemap module (sitemap.xml is in drupal root dir) there is no problem.
Thanks!