Bug or am I missing something ?

[blackcan]

Hey guys,
Now that I understood the basics I do a lot of quick missions to practice but yesteday I encountered something weird.

As I start I got 3 surface contact 1 I identify as a cruise ship and the other was a us patrol ship and the other was hostile.
The broadband showed me that it drives away in my direction.
So I gathered 4 different contacts on him
Bow array
Visual
EMS and towed array

So I was pretty good to determine his exact position.
But due the fact he was about 14-16 nmi Away from me I decided to attack him with Missles.
I shot 2 and both hit.
But it didn't count as a kill (no message)
So I drive in his direction to look if he is just not able to drive anymore (broadband and narrowband was silent).
But nothing no where.... so I decided that I end the mission and look in the replay what happend...
I saw there that it didn't got killed but according to "show truth" on the replay it was 1000 yards in front of me but there Was Nothing.
Was that a bug?