Easy Fix here. Sounds like your load parameter is a Type parameter, not an Instance Parameter. A Type parameter will be the same for all instances of particular family Type. An Instance parameter will be unique for each instance of a given family Type.
You need to edit the family and modify the Parameter, see attached image. If you're struggling with core concepts like this I'd highly recommend that you get yourself some training or review the documentation included with the program.
Cheers,
Kyle B
Kyle Bernhardt
Director
Building Design Strategy
Autodesk, Inc.