unwanted image flashes between slides

Hi, wonder if anyone can help please, I've created a module in storyline 3 and when viewing on the LMS an image from a previous module is showing as the slide changes to the next. I have checked the image isn't on the slide, the slide master or been formatted as a background and all are clear. The problem doesn't present when previewing within storyline. I would be very grateful of any suggestions of how to get rid of this rogue image...Thanks

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