Date & Time: All the time.
Frequency: All the time.
World name: Balmung
Character name: Mikha Sunthistle and alts
Retainer name: NA
NPC name: NA
Monster name: NA
Class/Level: NA
Party or solo: NA
In-game time: All the time.
Area and coordinates: NA
Housing: NA
Steps:
1. Have 99 problems but a Clear Demimateria III isn't one of them Clear Demimateria III
2. Get one more Clear Demimateria III.
3. You now have a stack of 99 and a second stack of 1. The two cannot be combined.