Problem with quiz question

Can anyone help me? I have a pick many quiz question created from one of Storyline 360's new templates. There are two correct choices and I have set the question for 2 attempts. But when you get one wrong, and click 'try again' you have to de-select the selections you made previously in order to try again. What am I doing wrong? Here's the link to the slide published on Aticulate 360 Review:

https://360.articulate.com/review/content/fdbe9478-431e-435f-b039-ca969624a89a/review

Cheers, Pip

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