Display error by traffic measure

[efodi]

I have into a problem by displaying traffic graph by cacti. Some of our graphs are working fine, but where the network traffic is going over Mbps to Gbps the graphs are displayed incorrectly. Mbps will not converted the Gbps, it will be displayed as Pbps??

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Has anyone an idea why the converting is not working by some of our hosts? I have checked the traffic with another tool, so I'm pretty sure this should be only some displaying issue. We are using a custom template for this graphs and cacti itself is on the version: Version 1.2.17

Could you please help me by this topic?