pfr Wow, you're running very few processes there indeed!
Program bug. There should be 40 processes in the screenshot.
The program assumes that child PIDs are always > parent PIDs--which is true on Linux (except when PIDs wrap-around), but not true on the BSDs:
$ ps -Ac -o pid= -o ppid= -o pcpu= -o rss= -o comm= | awk '$1 < $2'
714 788 10.6 39260 X
611 629 0.0 2188 top
629 1017 0.0 3320 bash
338 399 0.0 129572 firefox
399 424 6.8 301692 firefox
424 524 0.0 1864 sh
524 619 0.0 3312 bash
525 1049 0.0 1812 awk
614 1049 0.0 1772 ps
1049 1080 0.0 3316 bash
173 788 0.0 2772 evilwm
$
These processes (and their descendants) are not shown. With all processes shown, the radiation would've been more, erm, ramiferous.