SSL certificate works fine for 1 sub domain but not works for other subdomain

I've got the following problem.
I am using Windows 2008R2 server with Plesk 10.4.4. I have 2 subdomain say
1) www.test1.subdomain.org having binding settings say IP=10.1.1.2 and Port=8445
2) www.test2.subdomain.org. having binding settings say IP=50.72.139.100 and Port=443.
I have purchased seperate ssl certificate for both subdomain. I have installed SSL-certificate for...

SSL certificate works fine for 1 sub domain but not works for other subdomain