We had this happen at my company. I had set some new memory settings in a JAVA_OPTS environment variable due to heap issues. The DBA kept a tmux server running

We had this happen at my company. I had set some new memory settings in a JAVA_OPTS environment variable due to heap issues. The DBA kept a tmux server running and would periodically restart our app when they needed to do work on those tables it interacted with during maintenance windows. The heap issues kept occurring even though I triple checked the ENV variables. However, ps -ef showed the old values! Once I figured out he was using tmux the issue was resolved by closing out all sessions and starting new ones.