Asking about my activity points?

[rexsam4]

https://www.cloudskillsboost.google/public_profiles/dfe576d5-c443-4a1f-8134-cbab2f3e4b97


I calculate my badges one by one, excluding rewards. There should be 78 points.
But when asking qwiklab zendesk, the response was that I only have 73 Points,
Can someone do the math for me? a little anxious