Eureka - Pagos: Occasionally not receiving XP after defeating an enemy

[Gouka_Mekkyaku]

Date of issue: 8/7/18 - 8/8/18
Time of issue: All times
Frequency: 30-40% of the time
World name: Gilgamesh
Character name: Gouka Mekkyaku
Retainer name: Irrelevant
NPC name: Irrelevant
Monster name: Pagos Billygoat, Frozen Aevis, Val keeper
Class/Level: Irrelevant
Party or solo: Party
In-game time: All times
Area and coordinates: Eureka - Pagos
Housing:
Steps:
Kill enemy
No EXP rewarded

https://imgur.com/a/LasJuin

As you can see, the level difference between players is not significantly staggered. In one of those images, you can see that the XP was granted in one pull but not another pull. Even though there are only two images, there are numerous instances of this happening.

[Mholito]

You get little to no experience from enemies claimed by other parties. Are you sure that wasn't what happened? You can tell by looking at the colour of the nameplate. (the default is red for enemies claimed by your party and pink for enemies claimed by a different party)

[ManuelBravo]

If people attack them you get a xp penalty, it's nice they want to help yet you have to always be careful in areas where there are people. Some will attack just for Challenge book. IF your to high of a level difference from mob, roughly over 3 levels some mobs may not give xp being they are too weak. Same applies if your in a party. Too many people will ruin the xp specially if huge lvl differences. With the Exception of fates. It's mostly based on contribution there so penalty is not as bad.

[Vnolan]

I had it happen with a party of 25+ doing blobs. What happens is the kill just doesn't register - no exp and no continuation of the chain. No other players attacked the mob and there were over 20 seconds left on the chain when the mob died.