When you return to the first layout, all non-global objects you have placed in that layout are respawned. What you could do is make a global sprite that spawns your officeworkers, and use an instance boolean to check if the officeworker has already been picked. Then, on start of layout, spawn an officeworker on every spawner sprite with the boolean set to "false".
Edited .capx: railslaves_game.capx (r98)
(PS: I moved some overlay sprites to a different layer to get them out of the way and deleted some files to reduce the .capx file size. I would also suggest using groups and comments to make your project easier to navigate through. For yourself and others.)