Checkbox quiz continue button opens new browser window

I have a quiz submission with checkboxes on several slides. After the user submits their answer, the button changes to hidden and continue appears. The continue button trigger is for the next slide but it also opens a new browser window with a link. I can't figure out why this happens. There is no link hotspot or trigger with the link near those buttons. It also happens when the user click next. I have this mechanism on about 3 slides. See attached for the example.

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