Dashboard data(Metric) options

Hi, guys!
I want to convert dashboard display from bil to GB.Like picture.
But there are some incorrect information I found.
The informaiton on zabbix monitoring display is 125G and on grafana display is 134G.(125G is right display)
The grafana configure as Axe -> Unti -> data(Metric) -> bytes

Try try the EIC (non metric) bytes unit