Those look a lot like scripts an os run.
When you say war version. Can you walk us through how you are upgrading and how you are starting up Jenkins?
I havnt spent any time looking at the packaging scripts (I use docker myself) but the ps output you posted looks like something is calling something that is running Jenkins as the Jenkins user.
I feel like those scripts need to be updated to use exec but that’s a different issue (unless you wrote them)