Hi,
Okay, this issue is actually a combination of mixing www and non-www links and A1SG trying to be "smart"

First try scan
"http://puerto-vallarta-rentals.com/"
You will see entire blog gets included in scan:
"http://puerto-vallarta-rentals.com/blog/"
Then try scan (with www)
"http://www.puerto-vallarta-rentals.com/"
there the blog 301 redirects to
"http://puerto-vallarta-rentals.com/blog/"
...But A1 Sitemap Generator will actually instead show blog redirects to "http://www.puerto-vallarta-rentals.com/blog/" i.e. to itself...
The reason for this is that A1SG nowadays defaults to automatically
add root aliases to "fix" a wide range of errors such as website mixing port numbers, with-www vs non-www, http vs https etc. in their website URLs. This "auto add" of root aliases can be configered in "Crawler options" for those who wish to disable this feature.
Anyways, for a solution, either scan:
"http://puerto-vallarta-rentals.com/" (which then works fine with your blog)
or
make your blog use www
or
make your blog accept both non-www and with-www
Best solution though is that your configure your entire website to either use "www" or "non-www" to
avoid duplicate URLs. This will be an advantage for link building, ranking etc. as well.
Hope this helps
