check_mrtgtraf does not return out=

I have noticed that the performance data returned by check_mrtgtraf gives two in=blabla and no out=blabla

./check_mrtgtraf -F /home/nagios/mrtg/xx.xx.xx.xx/xx.xx.xx.xx_22.log -a AVG -w 1000000,1000000 -c 5000000,5000000 -e 10
Traffic OK - Avg. In = 9.2 KB/s, Avg. Out = 60.3 KB/s|in=9.155273KB/s;1000000.000000;5000000.000000;0.000000 in=60.314453KB/s;1000000.000000;5000000.000000;0.000000

does anyone know how to fix this?