Why htop shows multiple processes while top shows only one

[!NoItAll]

I have an application (written by a contractor for me) that shows as a single process when I run top, but when I run htop it shows from 19 (under light load) up to 76 processes when under heavy load. I am assuming they are processes because each one, under htop, shows a unique PID. Under top there is only one PID.
Many of the "processes" being shown by htop show 0.0 in the CPU% column - so I am wondering if this is highlighting a resource leak.
Could someone clue me in on what I am actually seeing here?
Here's a pix...

...there are actually dozens more below what this picture shows...

Thanks!

[Luuk]

Is are kernel thread.

From 'man htop':

K    Hide kernel threads: prevent the threads belonging the kernel to be displayed in the process list. (This is a toggle key.)
 
H    Hide user threads: on systems that represent them differently than ordinary processes (such as recent NPTL-based systems), this can hide threads
            from userspace processes in the process list. (This is a toggle key.)
 

so, pressing 'K' switches this off, (or on)...

This difference is also visibla with ps.
Look at difference if this:
ps -ef | grep vstreamer
and
ps -eLf | grep vstreamer