Tearing my hair out with variables! Help!!

I've created an SL free form drag and drop interaction.   And when my learners have dragged and dropped everything, they click on a hotspot which takes them to a slide which shows them what they got right or wrong.  Depending on whether they got them all right or some of them wrong, they click a button that either takes them to the next slide or returns them to the previous slide to try again.

I've used true and false variables to change states.  Some of the drag and drops work as expected and some don't.    And for the life of me, I can't see where I have gone wrong.

I've attached the SL file if anyone can have a look and point me in the right direction.

Helen

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