In topic http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3891717#3891717 you reference the jbpm.db project. Did the configuration from jbpm.db solve this problem?
If it didn't, note that your datetimes differ only by milliseconds. Take a look at https://sourceforge.net/forum/forum.php?thread_id=1292904&forum_id=240086. It discusses the issue of datetime accuracy in databases, particularly MSSQL.