Thank you for your detailed observations. I have tried to replicate the problem. If I click on the first link you provided,
http://thisisms.com/modules.php?name=Fo ... 9933#59933
using a Mozilla browser such as Firefox 3.0x or Mozilla 1.7.13 it takes me to the correct web page and displaying the specific post and does not drop the #59933 at the end of the URL.
However, if I use IE 7.0x and click on the above URL, it does drop the #59933 from the end but still takes me to the correct post.
In contrast, if I use either Firefox 3.0x, Mozilla 1.7.13 or IE 7.0x and click on the second URL, then the page behaves as you have described, it stays at the top of the thread.
What email program and browser are you using? In addition, are you clicking on the link from the email or are you copying and pasting it into the address bar of the browser?