Wrong month order

I have content from the following months (in chronological order): November 2008, February 2009, March 2009, August 2009.

In admin/settings/montharchive I set:

• Maximum month links in block: 12
• Sort links in chronological order: no

and I obtain a wrong order: November 2008, August 2009, March 2009, February 2009.

If I set

• Maximum month links in block: 12
• Sort links in chronological order: yes

the order is reversed, thus still wrong: February 2009, March 2009, August 2009, November 2008.