Aspect using pointcut=@annotation for @AfterThrowing is running twice

I'm facing a strange behaviour using AspectJ for a pointcut using my custom annotation.

The pointcut I use is:

@AfterThrowing(pointcut="@annotation(com.core.meta.NotifyOnFailure)", throwing="ex")

The problem I have is that my aspect is executed twice but if I modify the pointcut to:

@AfterThrowing(pointcut="execution(* sendAndReceive(..))", throwing="ex")

It runs once as expected.

The only method I have that raises the aspect is this:

    @NotifyOnFailure // I want to use this annotation to raise the aspect once
    public  String sendAndReceive(String serviceUrl)
    {
         String responseXml = "...";
         try
         {
             throw new Exception("test...");
         }
         catch(Exception x)
         {
            ExternalExecutionException ex = new ExternalApiExecutionException("Service failed");
            throw ex; 
         }
         finally
         {
             ...
         }          

        return responseXml;
    }

Any idea about why my aspect is executed twice when using my custom annotation and only once when I use execution pointcut?