One thing to consider: you are setting the variable to T or F but not excluding objects.
For example: if you set var to true if A, B, and C are selected, that doesn't exclude D, E, and F. Thus I can select all 6 letters and still meet the requirement of the trigger. You need a condition such as ABC are selected and DEF are not selected...something like that. Use not selected rather than normal.
Also, you can get rid of the reset triggers by jumping back to the slide and reset the properties to initial state. I'd also reset the variable to False.
https://360.articulate.com/review/content/b591d846-6ced-4147-898f-8ac5b124c844/review