My guess would be one of;
Hillary group asked them to (don't know if any promises were made) OR
She thinks Hillary would be more aligned with the green party views.
There doesn't seem to be any reason from the green party perspective in a recount, except a little news time, about half good or half bad depending on which side you are on.
I read in the Wisconsin recount, trumped gained a few votes in the end. 4951