Yeah my advice was to make the clicked object a different object, because I couldn't see why it needs to do be a drag/drop bowling ball if it is simply an icon you click in a menu? You can alter values when something is spawned, using the On Created condition, where you can say something like On Created > Enable drag/drop behaviour, where the clickable version has the drag/drop behaviour disabled by default.
To answer your question in a more general sense, Construct is all about picking. When you use 'on created' it picks the created instance and applies only to this. If you say change such a variable on bowling ball without picking a specific one with a condition then it will apply this to all bowling ball instances. It's really up to you to define in some way which of the bowling ball instances will change.