Markup showing different preview results in Confluence 6.3 as compared to Confluence 5.9

Steps to replicate :

1. Create a new page
2. Add the following markup :

   h1. test-Notes
   
   
   h2.Bugs
   * *[TEST-001|http://test.com/browse/test-001]* _| Ticket 001 | \[TEST-CRM\] | \[APP\]_
   
   * *[TEST-002|http://test.com/browse/test-002]* _| \[TEST-CRM\] | \[SERVER\]_
   
   * *[TEST-002|http://test.com/browse/test-003]* _| \[TEST-TEST\] | \[SERVER, RC\]_

Current result : Preview on Confluence 6.3 is showing wiki markup
Expected result : Preview on Confluence 6.3 should not show wiki markup

Screenshot from Confluence 5.9.1

Screenshot from Confluence 6.3.1