Unable to see calendar activity on imported repository

[Brainwave Resurrected]

I just imported a project from to gitlabs. However, on the activity page, the project shows no contributions over the past year. If I import same project to github, it shows the activity calendar as rightly populated. What could be the issue and how to solve it? I would really like the ability to click on a day in the calendar and go to the commits made on that day, even for those commits that were made before importing the project to gitlabs.