OVERVIEW
In HotStandby systems, whenever a machine previously in Standby leaves maintenance, it starts executing the application, while also keeping it running in the previously active server.
HOW CAN I REPRODUCE THIS PROBLEM?
- Execute the HotStandby domain
 - Set the Standby machine as In Maintenance
 - Then make it leave Maintenance mode
 
SITUATION
Elipse Software has confirmed that this is in fact a bug from the products listed by the end of this article. The correction download is here. 
THIS ARTICLE APPLIES TO THESE PRODUCTS:
Elipse E3 version 3.0 build 428 or lower
