Problem of value in the graph

Hello I'm using hobbit 4.2.0. I did a custom graph. the problem is that the value in the graph is different that the one given by the script ! The value "current" is above or below the good value.

Here is the configuration:

hobbitgraph.cfg

[httpd] TITLE Httpd YAXIS Connexions Httpd DEF:avg=3D3Dhttpd.rrd:httpd:AVERAGE CDEF:httpd=3D3Davg,1,/ -l 0 LINE2:httpd#@COLOR@:Connexions GPRINT:httpd:LAST: \: %5.1lf (cur) GPRINT:httpd:MAX: \: %5.1lf (max) GPRINT:httpd:MIN: \: %5.1lf (min) GPRINT:httpd:AVERAGE: \: %5.1lf (avg)\n

rrd.sh:

if [ "$TESTNAME" =3D3D "httpd" ] then HTTPD=3D3D/bin/ps -eaf|grep httpd|wc -l

    # The RRD dataset definitions

    echo "DS:httpd:GAUGE:600:0:10000"

    # The filename
    echo "httpd.rrd"

    # The data
    echo "$HTTPD"

fi

Thanks for your help.

Sébastien SANS