WRONG AGGREGATE MAXIMUM LEVEL

[DACOBELL]

greetings

i have a problem with my aggregate graph, i have added some data sources to my aggregate graph initially it was at 3.56G maximum so i added 1.8G yet when i plot on the graph mode the maximum level does not change it remains at 3.56G, but when i analyse using other traffic analyser medium my inbound traffic maximum is at 4.81G

please how can i solve this issue on cacti