After adding some members the distribution list is empty again

[Sprengel]

Hello,
I created some dynamic distribution lists. Our galsync addressbook is shared with writing rights. I added some external members / external email addresses to the distri list. everything is fine. but a few minutes later, the distri list is empty. maybe it was the gal sync interval event?
But how can I solve this problem?

[15337Raunaq]

ZCS version please

[Sprengel]

I'm sorry
It's 8.0.3