Log chain question

Hi all,

I've a database with recovery model = full. I perform full backup with symantec backup exec, the destination media are tapes. I perform transactional log backup with a scheduled job, the destination media is a shared folder on another server.

Is my log chain consistent?

If I query msdb.dbo.backupset I notice that the first transactional log backup taken after the full one made by backup exec, isn't identified with the "begins_log_chain=1"

what's wrong?