haproxy acl is not matched sometimes

gistfile1.txt

I have a strange problem, sometimes haproxy cannot match the host so it cannot use the backend and connections is being aborted in the browser. 
Do you know any solutions for this kind of problem. 
I am using HA-Proxy version 1.5.13 2015/06/23

You can see the problem on http://blog.ganipara.com with firebug or similar.

Here is a screenshot also:
http://berkayunal.com/share/sc_1B4AF7FE.png

Some requests are being dropped since hostname does not matches. 
If i add a like as "default_backend wwwother" into "frontend http-in" it works. 

Thanks

Below is my config. 

global
	log /dev/log	local0
	log /dev/log	local1 notice
	maxconn 4096
	chroot /var/lib/haproxy
	user haproxy
	group haproxy
	daemon
	
defaults
	log	global
	option	dontlognull
	option http-server-close
	option httpclose
	#option redispatch
	retries 3
	timeout connect 5000
	timeout client 10000
	timeout server 10000
	
frontend http-in
    bind *:80       
    acl host_blog hdr(host) -i blog.mydomain.com
    use_backend wwwother if host_blog

backend wwwother
    mode   http
    option  httplog
    option  httpclose
    option  http-server-close
    option forwardfor except 127.0.0.1
    balance first
    server node-1 10.133.157.XXX:80 check