Campaign Level 5 - wrong enemy theme used

On levels 6 and 7 your enemies use the Dwarven dungeon theme, which is perfectly appropriate since they're dwarves and all. However, on level 5 the regular Empire theme is used instead, even though you're up against a dwarven opponent once again. It's only a minor detail as there's not a huge amount of difference between the two themes - especially when their Dungeon Core is not seen in these levels - but it is something that nonetheless offends me to the very depths of my soul.