opmnctl show different memory usage that enterprise manager console and PS linux command in RSS colu

In my production environment when I run the command:

opmnctl status-l 

I get the list of active Forms processes, analyzing them to realize the value displayed some forms of memory usage is different from that presented by AT console this environment. 

Also if you run the command: ps-and pid, PMEM rss When I run this command PS also realize difference from the opmnctl, however this output of the PS chat with the EM console.

When I run this command PS also realize difference from the opmnctl, however this output of the PS chat with the EM console.

[oracle@blva57:~] $ ps -ef | grep 5519