HTML5 version of course does not retain slide status

We are testing a possible solution to this. We found we had a few T/F variables in the course and they are not compatible with html5. I can't find out to delete my post, so am just updating.

I have a main menu within the course. When a user completes a section, there is a variable on the last page of that section that then is set to change the state of the button on the menu to complete (showing a checkmark) when the timeline starts on the menu. This is working on a desktop, but is not working in HTML5. There are at times random checkmarks in sections I have not completed and at other times, the correct checkmark displays, but then if I exit and re-enter the course, the all of the checkmarks are gone. This is only happening when viewing the html5 version. Does anyone have any suggestions to resolve this issue? Thank you.