Surfactant bleed through
If the orange anomaly's are produced from the paint  it may not be dried enough. If so once it has dried completely it should be impervious to moisture.
If it is indeed surfacant's, as someone suggested I would think their source would be from steam laden with soap or shampoo. These two common cleaners are usually produced with surfacant's. Meaning they contain substances that enable the breakdown of oil (if I remember High School Chem 101 correctly).
Either way the solution is venting. While waiting for fan have the boys crack the window before they exit the room.