Akismet doesn't seem to work with forwarding domain

We manually moved our web site to a new server, using a different domain – from .com to .net. Recently we forwarded (without masking) the.com to the .net site. Since then, I’ve noticed an uptick in spam comments (all caught by Akisment, so it is still working on that score), but the comments are appearing as if they are being posted on .com, even though the .com is just being forwarded.

I’m wondering what is going on here? Why wouldnt the Akismet reports say .net since that is where the hosting is at?