Notifications not working properly when users create new account

Hello,
I use Anspress on my website, but notifications don’t work properly. This is the case:
When new users create an account the notifications shows the following:

When I click on the notifications:

When I check the reputation of a new user there are 5 point added (just like it supposed to be).

With everything else (answer create/answere questions, etc.) the notifications work properly.
How can I fix this?