Okay, thanks for the tips.
The problem actually resolved itself overnight. Normally, I would have waited as well, but I was a bit confused because at first, points were credited to the correct team and then back to the old one. Now, it seems to be working.
Unfortunately, I first joined the wrong team and then switched to the correct one. At first, the points were correctly assigned to the right team. However, they were later reassigned to the old team again. The correct team is registered in my profile, but the points are still being incorrectly assig...