Action Evaluation Precedence

[roxy]

We have two Action Overlapping:

[ACTION 1] -> A and (B or C) and D and E and F
A Maintenance status not in maintenance
B Template = Template SNMP traps
C Template = Template SNMP trap fallback
D Trigger value = PROBLEM
E Trigger severity = Information
F Host group <> Switches.Edge

[ACTION 2] -> A and B and C and (D or E or F)
A Maintenance status not in maintenance
B Trigger severity = Information
C Host group = Switches.Edge
D Trigger name like "tname1"
E Trigger = Template SNMP traps: "t1"
F Trigger = Template SNMP traps: "t2"

What is the logic under Action evaluation sequence/precedence ?
Why [ACTION 2] take precedence only if we set "F Host group <> Switches.Edge" [in ACTION 1] ?