wrong redirect?

I’m thinking developers should know about this ‘bug’
When pointing my browser to https://aim.pp.ru/blog/archives/2004/10/07/13/
I was redirected to the post https://aim.pp.ru/blog/archives/2004/06/01/13/, but my calendar show me the “October”.
Then I desided to add something after “/13/” and got somthing strange (the post https://aim.pp.ru/blog/archives/2004/06/01/13/ whithout the content but with the comment fild shown).
here is my .htaccess:
AddDefaultCharset utf-8
Options SymLinksIfOwnerMatch
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /blog/
RewriteRule ^test-page-??a??€??a?????a?????a??????a?¨???a?|???a?§/?$ /blog/index.php?pagename=test-page-??a??€??a???
??a?????a??????a?¨???a?|???a?§ [QSA,L]
RewriteRule ^feed/?([_0-9a-z-]+)?/?$ /blog/index.php?feed=_$1 [QSA,L]
RewriteRule ^comments/feed/?([_0-9a-z-]+)?/?$ /blog/index.php?feed=_$1&withcomme
nts=1 [QSA,L]
RewriteRule ^page/?([0-9]{1,})/?$ /blog/index.php?paged=$1 [QSA,L]
RewriteRule ^site/([^/]+)/(feed|rdf|rss|rss2|atom)/?$ /blog/index.php?pagename=$
1&feed=$2 [QSA,L]
RewriteRule ^site/([^/]+)/page/?([0-9]{1,})/?$ /blog/index.php?pagename=$1&paged
=$2 [QSA,L]
RewriteRule ^site/([^/]+)/?$ /blog/index.php?pagename=$1 [QSA,L]
RewriteRule ^search/(.+)/(feed|rdf|rss|rss2|atom)/?$ /blog/index.php?s=$1&feed=$
2 [QSA,L]
RewriteRule ^search/(.+)/page/?([0-9]{1,})/?$ /blog/index.php?s=$1&paged=$2 [QSA
,L]
RewriteRule ^search/(.+)/?$ /blog/index.php?s=$1 [QSA,L]
RewriteRule ^archives/category/(.+)/(feed|rdf|rss|rss2|atom)/?$ /blog/index.php?
category_name=$1&feed=$2 [QSA,L]
RewriteRule ^archives/category/(.+)/page/?([0-9]{1,})/?$ /blog/index.php?categor
y_name=$1&paged=$2 [QSA,L]
RewriteRule ^archives/category/(.+)/?$ /blog/index.php?category_name=$1 [QSA,L]
RewriteRule ^archives/author/([^/]+)/(feed|rdf|rss|rss2|atom)/?$ /blog/index.php
?author_name=$1&feed=$2 [QSA,L]
RewriteRule ^archives/author/([^/]+)/page/?([0-9]{1,})/?$ /blog/index.php?author
_name=$1&paged=$2 [QSA,L]
RewriteRule ^archives/author/([^/]+)/?$ /blog/index.php?author_name=$1 [QSA,L]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/([0-9]+)/trackback/?$
/blog/index.php?year=$1&monthnum=$2&day=$3&p=$4&tb=1 [QSA,L]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/([0-9]+)/(feed|rdf|rs
s|rss2|atom)/?$ /blog/index.php?year=$1&monthnum=$2&day=$3&p=$4&feed=$5 [QSA,L]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/([0-9]+)/page/?([0-9]
{1,})/?$ /blog/index.php?year=$1&monthnum=$2&day=$3&p=$4&paged=$5 [QSA,L]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/([0-9]+)/?([0-9]+)?/?
$ /blog/index.php?year=$1&monthnum=$2&day=$3&p=$4&page=$5 [QSA,L]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/(feed|rdf|rss|rss2|at
om)/?$ /blog/index.php?year=$1&monthnum=$2&day=$3&feed=$4 [QSA,L]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/page/?([0-9]{1,})/?$
/blog/index.php?year=$1&monthnum=$2&day=$3&paged=$4 [QSA,L]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/?$ /blog/index.php?ye
ar=$1&monthnum=$2&day=$3 [QSA,L]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/(feed|rdf|rss|rss2|atom)/?$ /blog/
index.php?year=$1&monthnum=$2&feed=$3 [QSA,L]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/page/?([0-9]{1,})/?$ /blog/index.p
hp?year=$1&monthnum=$2&paged=$3 [QSA,L]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/?$ /blog/index.php?year=$1&monthnu
m=$2 [QSA,L]
RewriteRule ^archives/([0-9]{4})/(feed|rdf|rss|rss2|atom)/?$ /blog/index.php?yea
r=$1&feed=$2 [QSA,L]
RewriteRule ^archives/([0-9]{4})/page/?([0-9]{1,})/?$ /blog/index.php?year=$1&pa
ged=$2 [QSA,L]
RewriteRule ^archives/([0-9]{4})/?$ /blog/index.php?year=$1 [QSA,L]
</IfModule>
# END WordPress