Cracked materia exchange: unknown macro code ('num2') warning

Time: yesterday, 9:56pm gmt+2
Frequency: once
World name: Ragnarok
Character name: Crim Soukyuu
NPC name: Calamity Salvager
Monster name: N/A
Class/Level: Monk 50
Party or solo: solo
In-game time: not sure, night?
Area and coordinates: Old gridania
Steps:
1. exchange 2x cracked materia III for 2x savage aim materia III
2. the chat message will read: "You restore the aether to <WARNING: unknown macro code ('num2')> cracked materia III and obtain <WARNING: unknown macro code ('num2')> savage aim materia III"
3. materia exchange itself finishes fine

Connection Specs
- Type of internet connection/provider: ADSL/1&1