User Total Activity Count

Hello

I exported a list of 'active' users from the community, filtered to show employees only. The export contains a column called Total Activity Count, and so I assume that counts all the 'things' that someone has done in the community.

So I look at one particular user who's Total Activity Count is 430. However when I go to that person's profile, I see the user has only 2 points and almost nothing under Activity. This doesn't seem right.

What is Total Activity Count actually counting?

Thanks

Oli