Anim Class in a child blueprint


I would like to ask about one little problem.
I have a character blueprint class where some anim class is assigned for the mesh. And i have several childs of this class where i assign the same anim class. Everything is working fine.
But then i open editor next day and see my guys have None anim class. I assign again and then next day see None as usual.
Tried to make childs from the beginning and anyway the same problem.
From time to time appear other problems like wrong (not taken from parent) rotation values and position.

How could i solve this?

Up. Any ideas how to fix?