What is your system setup ?
What OP system are you using ?
What miner program are you using ?
What is the version number for the miner software are you using ?
What is in the .bat file , or in your start file or whatever ?
What AMD driver version are you using ?
Are you using any tune software ?
Card are overclocked ? modded ?
If you are using windows, your virtual memory is set larger ?
.
.. and no ... 13.8MH/s is not normal at all