Slides are auto advancing - unwanted

So I created several training modules. (Using Captivate 2023) All of them work well, except one. For some odd reason when I test it in the Adobe Learning Manager, the slides will move to the next slide, but then a second later move to the one after that. So the reader is seeing a second or two of the next slide in sequence and then it move to the next one. This happens periodically throughout the module, so I am not sure what is wrong or what setting I might have off. I tried putting in a bookmark to stop play, but that didn't solve the problem.