I think steps were added to the lessons, I have less than 100% on these now as well.
Changes have been made recently to the curriculum in order to better serve the needs of the freeCodeCamp community.
The lessons and project steps which have been added or substantively changed will not be marked as “completed”, which can impact your reported course competion percentage. This will not impact claimed certificates. If you have already completed a project, then you are not required to complete the new steps. Any lessons which are not part of a certification project are always optional.
Only the 5 certification projects count towards the certificate.