Macvlan networks

i need help BAD.
When setting up macvlan im having issues with docker assigning ip below specified range.
as example i have subnet of 10.1.1.0/24
gatewat of 10.1.1.1
i set ip range to 10.1.1.50/28 expecting 16 addresses that start at 10.1.1.50
docker assigns 10.1.1.48

help i have set up through docker network create and portainer with same outcome