Display MoreYour script or whatever it is measures the Xms value of the JRE.
Xms is the initial memory allocation pool and not related to the maximum of RAM what your server can use.
In addition Java has more settings to configure RAM usage for different part's of the JRE which are not considered by most of the plugins which show RAM usage of servers.
Before creating such posts and blaming other people I'd recommend to get yourself familiar with Minecraft/Java and how it works under the hood.
Sir i am not blaming you guys. i was just why my Server Ram is low. I f you cannot help then thank you and btw i configure both Xms and Xmx.