Date & Time: 2018-03-13 , 2:30pm EDT
Frequency: Happened Once
World name: Sargatanas
Character name: Neo Phantome
Class/Level: White Mage 70
Area and coordinates: Eureka

Steps:
1. Leveled in Eureka to level 5
2. Did the level 5 quest for extra magicite.
3. Gained some more exp in a new Eureka instance
4. Left Eureka then loggued out to go on an Alt character
5. Loggued back in on main after approx. 20 minutes
6. Reentered Eureka via Party finder.
7. Saw that my character level was resetted to Elemental level 3

Thank you for your time.