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Cannot limit RAM in any containers

my divice is raspberry with openwrt OS. i install docker on my divice ,and i can use it very well.But i can not limit RAM in any container whether i limit RAM before i creat containers or limit it when my container is running and stopped.

when i click submit , all my setting will be dispear, and the limited will be failed
can someone help? i have seen lot of tutorials but i cannot solve it?
or can i limit the docker itself?