No exp being gained in Eureka

[Sylvastreak]

Date & Time: 1/4/18 19:50 ST
Frequency: constant
World name: Zodiark
Character name: Lissa D'ylisstol
Retainer name:
NPC name:
Monster name:
Class/Level: 70 / 11
Party or solo: partied
In-game time: 7:22pm
Area and coordinates: Eureka (18.5 , 31.9) Base camp
Housing: The Lavender Beds, Ward 18, Plot 5

Have taken a party into Eureka, lvl 11 w/ a level 10, lvl 1 and lvl 3. Our lower lvl party mates are not gaining any exp at all from mob kills. Also had this problem last night between 12am and 3am ST with a lvl 9 party mate. The only exp we were getting even for killing mobs 3 - 4 levels above ours was from NMs in FATEs. What is going on??