Quiz ends after 25 seconds

I've authored lots of quizzes and posted them on my LMS without trouble. But one of them, when running on my LMS, runs for only 25 seconds and then advances to the next slide. You can see the little timer bar going across the bottom of the slide, as if it were a typical narration slide. I've check the "time limit" feature on quiz properties, and it is NOT on. What else could be causing this? i want this quiz to be untimed..

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