Package execution completed. But Data Flow Task inside is still going on - Please help!

Hi,
I have a SSIS 2012 package. I executed  it in my SSDT. After some time it showed 'Package execution completed with success'.
But when i see the components inside, still one Data Flow task is running.  Then how come the package got completed, that too, with the 
Package execution completed with success . click here to switch to design mode. Please help!