Well it is not the links but the active threads pages that are formatted different than viewing the actual posts.
The reason is active threads does not have all the data view-able like when you view more due to the view topic includes the user posting profile if you are using the profile side option.
The default format is 100% table/div width.
There is a setting in the cp but that would change all pages.
The setting is not available in the cp,Even the templates. But I am sure it could be hacked to accommodate your needs. But it would be a custom mod.
So I suggest to ask over at ubbdev.com
