Well, I could not technically conclude, why the signatures did not sync between the http://subkeys.pgp.net:11371/ and http://pgp.mit.edu:11371/ key server, but thought of doing a manual update to http://pgp.mit.edu:11371/ server. I know that it is risky to play with the gpg key without proper backup. My instinct was so strong to just check whether I can sync it manually, so I just edited my 'gpg.conf', after taking a backup;
prasad@mayobhava:~$ gpg --send-keys A526A4A5
gpg: sending key A526A4A5 to hkp server pgp.mit.edu
Then I just verified the signatures on the web and now they are synced. Have a look at the screen shots below.
When in doubt, use brute force. - Ken Thompson