Have you try this at home?

Can anyone explain how this happen?

 

Try posting a image that isn't cropped. Also it would be hard for us to know if that's from another server or if it's ours.

 

it's in gamezaion.

 

Since it's a cropped picture, can you send the whole picture.

 

As per requested

 

Alright! I'll forward this to higher staff and do some tests along the way. Thank you!

 

There is no way to socket an Arbiter item or non Archdaeva items with Archdaeva manastones. Unless we are talking about modified itempak which has been around for quite sometime now.
Don't get me wrong, using modified itempak is against the server rules:
You may not use cheats, automated software, hacks, or any type of unauthorized third-party software designed to modify client behavior (especially to gain an advantage) unless authorized to do so by Gamez Network Management.
It's not the first time I come across socketed Archdaeva manastones in a non Archdaeva gear. And also let's not forget the cross remodeling (ranger in chain, sorcerer in plate and so on) which is also modified itempak related "issue".
I have already spoke to the admins about it and unfortunately I haven't received any positive response regarding this mess but I will definitely try again.