Server hacked !?!?

Hi @palej
thanks for your answer ...
I use Blocsapp with Pulsecms features. Now I scan a few sites I have created. At some pages I can't find anything ...And other pages I found same issues ...
Do you know what that is ?
For example,

00
04


For example what's that ? .git/HEAD is this a normal pulse file ?
And the tracker.php works on some sites but not with all sites ...why?

thanks for your help