When I "compile, test drive" a set, it will install that set to the mapping but remove the other.

So for instance, If I compiled the PLEX set in BCK and then map all the buttons, then compile Slingplayer set, it will remove the PLEX set from the mapping screen.

Another thing that is happening is that it is creating two PLEX or Slingplayer icons in the mapping screen. I briefly asked this in another thread, and you told me to go remove it from the behaviour folder but this removes the wrong icon. I can not set the behaviours I created to the mapping icon which is left.

I hope this made sense. :/ 

Remote Buddy tracks Behaviours by their identifier, not their filename.

So what did likely happen in your case is that both of your Behaviours 
share the same identifier. You can find that identifier in BCK > 
Behaviour Factory > Specifications and Metadata > Behaviour Bundle 
Metadata > Identifier.

Please make sure your two Behaviours have different identifiers. That 
way Remote Buddy can tell them apart and should show both of your 
Behaviours.

Extra Tip: 
By dragging an application directly onto the list in BCK > Behaviour 
Factory, Remote Buddy fills out all fields for your new Behaviour 
correctly and also makes sure that the identifier for your new 
Behaviour is unique to that application and isn't shared across 
multiple Behaviours.

Best regards, 
Felix Schwarz