I finally abandoned the idea of spawning the hand actor so now i use the default Template style and it worked.
the reason I create Hand class independently is because it gives me more control as i can implement some logic directly in the hand actor.
as for the code what part should i share? as i drop already an image of how i spawn and attach on begin play. i enabled replicates in the Hand blueprint. even though the other way round finally worked, i will be glad if i understood what the issue with the first solution is actually.