Aggregate plugin abnormal spikes

[mxljosh]

Hello,
I recently installed the aggregate plugin to monitor 3 flexlm license server and graph their usage in one combined graph. The numbers are correct, but the graph always has tons of spikes like the attached picture. Does anybody know why this is happening and a possible fix? Any help is greatly appreciated!

Here is the output:

/usr/local/rrdtool/bin/rrdtool graph - \
--imgformat=PNG \
--start=1424717759 \
--end=1424804159 \
--title='cadence_COMBINED_Virtuosso_Incisive_HDL_Simulator' \
--base=1000 \
--height=120 \
--width=500 \
--alt-autoscale-max \
--lower-limit='0' \
COMMENT:"From 2015/02/23 10\:55\:59 To 2015/02/24 10\:55\:59\c" \
COMMENT:" \n" \
--vertical-label='Licenses In Use' \
--slope-mode \
--font TITLE:12: \
--font AXIS:8: \
--font LEGEND:8: \
--font UNIT:8: \
DEF:a='/data/usrlocal/adm/cacti/rra/xxx-license_inuse_17436.rrd':'inuse':AVERAGE \
DEF:b='/data/usrlocal/adm/cacti/rra/xxx-license_inuse_17436.rrd':'total':AVERAGE \
DEF:c='/data/usrlocal/adm/cacti/rra/yyy-license_inuse_16619.rrd':'inuse':AVERAGE \
DEF:d='/data/usrlocal/adm/cacti/rra/yyy-license_inuse_16619.rrd':'total':AVERAGE \
CDEF:cdefa='a,0,*' \
CDEF:cdefb='b,0,*' \
CDEF:cdefc='c,0,*' \
CDEF:cdefd='d,0,*' \
CDEF:cdefe='TIME,1424804072,GT,a,a,UN,0,a,IF,IF,TIME,1424804072,GT,c,c,UN,0,c,IF,IF,+' \
CDEF:cdefh='TIME,1424804072,GT,b,b,UN,0,b,IF,IF,TIME,1424804072,GT,d,d,UN,0,d,IF,IF,+' \
AREA:cdefa#FF00FFFF:'' \
AREA:cdefb#FF0000FF:'':STACK \
AREA:cdefc#FF00FFFF:'':STACK \
AREA:cdefd#FF0000FF:'':STACK \
AREA:cdefe#FF00FFFF:'In Use\:':STACK \
GPRINT:cdefe:LAST:' Current\:%8.0lf' \
GPRINT:cdefe:MAX:'Maximum\:%8.0lf\n' \
LINE2:cdefh#FF0000FF:'Capacity\:' \
GPRINT:cdefh:LAST:'Current\:%8.0lf'