Drag and drop help needed

This is my first question - so forgive me for maybe asking a silly question!
I am obviously new to all this..... I am making a drag and drop interaction that requires the learner to decide which principle a statement belongs to.  

Due to the size of the statement (lots of words) I need the statement to change state when dropped on the correct target - which I thought I had done...  but it doesn't seem to.

I have created a trigger to change the state - but it doesn't seem to be working - HELP!


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