Multiple choice answer not reflecting the right score

I'm setting a quiz that includes a multiple choice question that have 8 possible options from which only 6 are correct. Even if I select the right 6 answers the score won't reflect as such.

I'm suspecting this is being caused due to the amount of answers and already advised my SME to change the question (as I also think these kind of questions aren't great) but I still wanted to know if this is a known issue or if there's a workaround for it. 

I'm sharing just the question that's giving me problems and below of the link are the right answers:

https://rise.articulate.com/share/cK4VT3phuJaW6ZbrkKZSXOYARHqNZ_dz

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