hello,

to reproduce:

1. prepare any latest GA zabbix, with some of collected metrics in DB,
2. configure dashboard with 4 graphs: two classic, two "new" - in my case i used agent item, and snmp item
3. classic graph should be configured like: refresh 1min, source: simple graph, time period: dashboard, show legend: yes
4. "new" graph should be confiugred: in data set, select "Approxmination: all", select "aggregation function: not used". then, go to "legend", and mark checkbox near "display min/avg/max"
5. set time filter to "last X days" (to use trends)

in a result (example attached), on classic graph, for "max" value i have "3.51 MB",
but on "new" graph i have "3.5 MB",
for snmp item difference is much bigger, "11.88 Mbps" vs "222.26 Mbps",

why it's like that?