Found it, no this should not be happening and is a glitch that only a few new members have reported. We are happy to announce we have finally figured out exactly what is causing this glitch and better that it will be included in the list up minor updates this week! Simply put, you edited your post, and the last edited time was being used when scanning your posts when you first joined. Existing members are not effected by this glitch since their new posts are picked up minutes after they post them, and new members who have not edited any posts in the last week would also not be effected by this glitch. Thank you for bringing this to light we are finally able to squash this bug once and for all!