Rise not saving progress

Hi,

We've created a course in Articulate Rise, exported it as a SCORM 1.2 and uploaded to our custom LMS. The course is made so that the user has to complete a section before they can move onto the next one. The issue we are having, is that the user may start a course and complete a few sections, but then leave to continue later on. When they go back into the course, the course does start from where they last left off, but all the sections they have done previously are now no longer marked as completed, meaning when they try to go to the next section from where they left off, it's not letting them move onto the next section as it's saying all previous sections need to be completed, even though they have already done this. Is there a fix for this?