Progress Not being Updated in the courses

Hi,
I am a student enrolled in Interview Preparation Online course. I have been noticing from two three days that my progress of the lectures completed is not being updated at the server end.
It shows green tick when I complete a video but when I visit Coding Blocks in the next session all the progress gets reset.
Kindly fix this bug.
You can contact me for more details if required.

Reproduce the reset in the Interview Preparation Online course by completing a lecture, confirming the green tick, and returning in a later session. Trace where lecture progress is sent to and restored from the server; done means completed lectures remain marked after revisiting the course and the regression is covered by an appropriate test.

Written by the indexing model from the issue text.