What version are you running?
We found this on 2.5.6.1, but it also occurs on demo.reviewboard.org (3.0.3 alpha 0 (dev)
What's the URL of the page containing the problem?

What steps will reproduce the problem?
See image attachments.

What is the expected output? What do you see instead?
The . should be excluded when the link is generated.
What operating system are you using? What browser?

Please provide any additional information below.