Time: May 29, 2014.
Frequency: Always
World name: Ragnarok
Character name: Daemian Basthion
NPC name: None
Class/level: Scholar/50
Party or solo: Solo
Race: Miqo'te male
In-game time: 3.40 p.m.
Area and coordinates: Mor Drhona (22,27)

Steps:
I simply cast Aetherflow to get three stacks, then I used Sacred Soil and, immediately after, I cast Shadow Flare. Casting the second spell would uncast the effect of the first one (one way or the other: SS > SF; SF > SS)

Thanks in advance.

P.S: If this thread already exists, I'd like to apologize beforehand. I didn't find any thread addressing this bug (at least, in 2014).