Does BOINCstats get team stats in the updates from the projects, the same way they get individual stats? Or does BOINCstats take the individual's stats and aggregrate them to calculate team stats? Are individual and team stats updated at different times?

In todays daily update it shows I (individually) had a total of 436,159 credits reported, the rest of my team-mates (as individuals) reported another 74,781 credits, which should add up to a team grand total of 510,940 credits. But on the team's detailed stats page only 386,349 credits were reported -- less than my my individual contribution alone never mind that of my team-mates

Teams stats are taken from a separate export generated by the project.

Thanks for the quick reply ... I guess I'll wait until tomorrow's update and see if things sort themselves out and if not I'll go ask my question at the project. Looks like the credits are missing from MilkyWay.

And at the projects only those credits are attributed to the team, that were granted while the cruncher belonged to the team.

Team points are only those points which were earned while you were a member of the team. If you were to change teams today, you would contribute 0 points to the team until you started earning more points. That is why your team's total credit is less than the sum of its members have individually.

Can also be more, if a big supporter left not too long ago
The credits of leaving members are to stay with the old team they were crunched for.

Exception is CPDN (and it's sub-projects), here the credits will change team with the user.