pid not shown with ps command - QNX 6.1

When pid crosses 8 digit mark (i.e. pid becomes 9 digits), they are no more shown with ps command.

pid of some processes are shown when ‘pidin’ is used but pid of login shell is not shown. However, I could get the pid of login shell using ‘echo $$’ command.

Is it a know issue with QNX 6.1 or am I doing something wrong.