Matching drop down quiz does loses choices on 2nd try.

I have used a matching drop down quiz that works great the first time through but then when the user has to "try again" the first one or two choices are gone.  I thought that maybe it was because they chose correctly on that item but when I tested it - nope not the case.  So then I started from scratch with my slide (twice) but it works the same both times.  I have attached just that slide here ... if someone could take a look.  Its probably something dumb I have done.  But the course is almost ready for production so I really need to know how to fix this.

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