Gem decrease after moving ANB character to main account

[Don Quijote]

Thank for your information. May be some of my kids, any way you had made a great game

[Travis | Support Mgr.]

It looks like you used some Gems while offline, which means I can't tell what you spent them on. I can see that you had 1,457 Gems when you logged in on the 13th and 390 Gems when you logged in on the 14th. I can also see that you have received a total of 5,900 Gems and spent a total of 5,089, leaving you with the 811 Gems you currently have.

So, even though I can't tell you what you used your Gems for offline, I can tell you that all of your Gems are accounted for.

[Don Quijote]

Yesterday is end of ANB event. It's my second ANB and it's was great so I want to say thanks to all of you who develope this game.
I plan to keep my character after event, so I keep a slot open, then end event.
The issue is, before this I remember I have over 1k gem, but after end event and login to the new character, I found that my gem down to nearly 400.
Is it a normal behaviour that gem will be decrease after keeping ANB hero?
Or if not, can some body tell me where's my gem spend to?