Post Width Issue

[mr.trichomes]

I have a sidebar column mod installed and active for every page on the forum, the width of the forums list, thread list page, etc. are all good, but when I click a thread to view all the posts the width is decreased only on those pages. I tried edditting the post bit legacy template but the width already says 100%, im guessing this could have something to do with the table class or id but I am not sure, I think the picture is pretty self explanatory, I just want the posts to look like the rest of the forum which is 5px space inbetween the sidebar and the content. Thanks in advance to anyone who knows how to fix this.

Edit: there is no support for this specific sidebar mod at all that is why I am asking here.