This is an issue with your htaccess or mod_rewrite on your server. Try overwriting your .htaccess with this snippet from the WordPress codex. Or see the mod_rewrite section that is also on that page.
This is an issue with your htaccess or mod_rewrite on your server. Try overwriting your .htaccess with this snippet from the WordPress codex. Or see the mod_rewrite section that is also on that page.