https://sourceforge.net/p/forge/site-support/9802/
It looks like there is an issue when an spam review / negative(1 star review) is made on a project. While marking the review as spam works fine, the issue is the overall rating still shows the review:
https://sourceforge.net/projects/jailer/reviews/?sort=created_date&stars=0
http://imgur.com/BWFGXwu
I'm just referencing this because it was mentioned in the ticket:
https://sourceforge.net/p/allura/tickets/6295/
It does look like this issue or a version of this has been address, but it was from a while ago.