Pflow shape instance changing from event to event


Anyone know how to avoid pflow from Changing particle shape when going from one event to another?
I have a set of objects as my shapes and I put them in a group and picked the group in instance shape node in my flow and checked “group members” tick on.
I tried placing instance shape node in every level i could (inside my event, multiple instances in both my events, on global level under “render” node) but no luck.

EDIT : i also tried other options like -linking my shapes to a single shape and picking it up as the instance and checking “Object and children”. because someone said groups suck. but no luck!