under "Memory Usage " checkbox memory unit name needs to change

Steps :- 

1. login as admin.
2. go to dashboard > " Memory usage " checkbox.
3. now observe details of memory unit (Mi).
4. now ssh login from terminal.
5. run free -m command and oberve.

Actual result :- under "Memory Usage " checkbox memory unit name is wrong displaying.

Expected result :-  It should display as valid memory unit. value should be display by frre -m command.

See screenshot :-