pickerGroupField not showing all list of groups as per the group filter

pickerGroupField not showing all list of groups as per the group filter value given. 

Scenario:   Group A has a list of 10 groups. Used a PickerGroupField and mapped group filter property with the Group A value. It is showing only 5 of the groups and not rest of the 5 under Group A.

Verified the security and parent group correctly mapped on all 10 groups. The security on all 10 groups, need admin user. My user account is an admin account but able to see few groups only.

Please advise on possible causes and respective solutions.

Code:

a!pickerFieldGroups(
label: "Select target group to add the selected user(s)",
labelPosition: "ABOVE",
groupFilter: cons!NSA_AllTQRMUsers_Group_Cons,
maxSelections: 1,
value: ri!usermgmt.groupToAdd,
saveInto: a!save(ri!usermgmt.groupToAdd,save!value),
showWhen: ri!usermgmt.actionChosen = "ADD",
validations: {}
)