Myblog and sef advance problem with lower case

I noticed that myblog articles urls don't have lower case characters conversion using sef Advance 5.9.4 joomla 1.015 (i downloaded a sef_ext from myblog). In google analitycs I see duplicate content with lower case urls and upper case urls. Any advice to avoid the problem?
Thanks in Advance!

Please talk to myBlog author, they created the extension (for J1.5). Advice them to use sefencode() function which does this automatically: www.sakic.net/support/sef_advance_extensions/