Date & Time: 3/14/18 but noticed it on 3/15/18 about 12 a.m.
Frequency: Once
World name: Midgardsormr
Character name: Chrono Saber
Class/Level: 70 RDM/NIN and 8 in Eureka
Party or solo: Both
Area and coordinates: Forbidden Land, Eureka

Steps:
1. On 3/13 I leveled in Eureka to level 4 as NIN.
2. Got up on 3/14, level 4 in Eureka, leveled to level 8 from about 10 a.m. till 8 p.m. in multiple instances and groups, playing as RDM, not NIN, all day.
3. Left Eureka to catch up NIN quests so i could get the antiquated set.
4. Went back to Eureka at midnight, entered as NIN, not RDM, and my level was reset to level 4, the same level I was last time I played as NIN in Eureka.
5. I finished a notorious monster fate, earning exp, before I realized my level was reset.