When using suffixes in trigger expressions , the trigger line in graph do not take the suffix in account :
using

{host:sysUptime.last(0)}

<1h, the trigger line in the graph and legend is '1' rather than 3600.

I have the same problem using complex triggers :

{host:system.cpu.load[,avg5].min(#2)}

>{$MAX_CPU_LOAD} is OK
but

{host:system.cpu.load[,avg5].min(#2)}

>2*{$MAX_CPU_LOAD} gets a trigger line at 2.