COURSEPRESS PRO | UNITS ASSESSMENT PROBLEM

Hello,
Course units complete percents are changing when we made assessment. Due to this students couldn't be able to finish the course that enrolled. Let me explain the issue with one example. We have a course which contain 4 units, and all units end with mandatory answer field, so we can do assessment student's answer. And student could pass first three units not having any assessment problem. But when we made assessment for fourth unit (last unit for this course), third unit complete percent changed from 100% to 33% and third and last unit complete percent stuck in to 33%. What's wrong with it? I added a ss, so you can see the problem.
Thank you