Consider the following as I believe the key to understanding the order is that the trumpets (God's wrath) is contained WITHIN the seals notabaly the 6th.
Seal 1
Seal 2
Seal 3
Seal 4
Seal 5
Seal 6 -----> Trumpet 1,2,3,4,5,6, (God's wrath)
Seal 7 -----> 7th trumpet Christ's return (Lamb's...