Some graphs stopped graphing

[xibalba]

Hello,
I've recently deployed cacti, and have it setup to monitor a few machines. On some of the graphs it seems as though the data has stopped graphing, there are no errors in the cacti.log the OID's return correct data. It seems to be dependant on the host. On some hosts Generic SNMP interface stats work, but on others it seems to have stopped graphing (there is some graphed data however).
I'll post the login to the guest account here, hopefully it's an easy issue to resolve.
Thanks in advance

http://proxy.rndcomputing.com/cacti/
guest / guestpass

[xibalba]

i seemed to have resolved the issue by recreating the devices.