Previous button not working consistently
I have a few screens in a SL2 course that have links on them. If the learner tries to click the next button before they have clicked the links, I show a layer asking them to click the links.
When they have clicked all the links, the Next button lets them go to the next screen.
When the learner is on the next screen and clicks the Prev button, sometimes it goes back to the previous screen, and sometimes it goes back to the layer (whether or not the layer was the last screen shown).
In one case, when the Prev button is clicked it goes back to the first screen at the beginning of the course.
Can anyone please tell me why it is working differently?