I would there are more auras not working or partially working:
Imperial Aramor creature ID: 706529
Rustgold Madhorn creature ID: 877431
First test at 0%:
So I guess the damage is calculated:
Imperial Aramor attack 130*1.5=195
elemental def after first defense reduction: -138
damage for first attack -> 195 -(-138) = 333
So only one of the 2 attackbonus is working....