I noticed something like that too. In new design, when i post something, after the refreshing of the page, i see that my post written 3 hours ago. But in real, i have just posted it...
Forum Post Time
If you need help, please contact our Help and Support team.

I noticed a few posts that said "A few minutes ago" for the post time, and I had thought I had seen them a while ago.
Sure enough, when I switched out of the beta, the actual time stamp was 3 hours ago.
This is kind of a deal breaker to me. I am not going to be able to use the beta very much while all of the forum timestamps are messed up.