Knowledge check not advancing to next slide when user submits

After viewing this slide, the user is to select an answer and then select "submit." The right/wrong information should be provided and then they advance to the next slide. I am being told by users that they get stuck on this slide and it will not advance. I can not replicate this issue and have no problems with it advancing. Could it be a platform issue? I have these exact triggers/settings on other question slides with no advancement issues. Any suggestions? 

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