Here's an update that I think will pass your check. I've also checked it in-game.
Code:
<ImageStyle Name="exp20_dun_djinn_palace_03_solo" displayname="Vaashkaani: Every Which Way [Solo]" zonerect="-486, 208, -341, 376">
<ImageFrame Source="images/maps/map_exp20_dun_djinn_palace_03.dds" SourceRect="0,0,436,506" />
</ImageStyle>
<ImageStyle Name="exp20_dun_djinn_palace_03_easy" displayname="Vaashkaani: Every Which Way [Event Heroic I]" zonerect="-486, 208, -341, 376">
<ImageFrame Source="images/maps/map_exp20_dun_djinn_palace_03.dds" SourceRect="0,0,436,506" />
</ImageStyle>