Graph only plots 1 point

[Ob1]

This is my first experience with cacti (0.8.8b) on Debian. I have my data source set up to run a script and return 3 variables all ploted as lines on the same graph. So far i can only get it to graph the very first point and then nothing. I have tried to setup the poller to execute every hour (3600), so i set the heartbeat to 7200.
Any ideas why the other data points aren't plotting?