Captivate to prime issue

Hi

I have an issue with a 2019 Captivate project in that when I view my project in Captivate it is fine but when I publish to Prime using the automatic publish to prime action and view in the "Learner" view it is missing the first slide and starts on slide 2 always.  What could the problem be, this project was created from a PowerPoint originally, any ideas why it’s doing this.  It was working fine and then I edited some slides and now won’t view correctly in prime.