Quote - So, can that error be fixed by the user, or is it something that can only be addressed on Rendo's end?

The stylesheet being generated in the wrong place in the page will have to fixed by the programmer(s).

To fix things using the user stylesheet, you'll have to alter all the colours explicitly, as one side effect of the misplacement appears to be the styles not cascading as expected.

Below is as far as I got with finding the places to change (only checked in SeaMonkey)

/* user style begin */<br></br>a { color:#00FF00; }<br></br>a:hover { color:#00FFFF; }<br></br>a:active { color:#FFFF00; }<br></br>a:visited { color:#FF00FF; }<br></br><br></br>.content_cell { color:#FFFFFF; background-color:#303030; }<br></br>a.content_cell { color:#00FF00; }<br></br>a.content_cell:hover { color:#00FFFF; }<br></br>a.content_cell:active { color:#FFFF00; }<br></br>a.content_cell:visited { color:#FF00FF; }<br></br><br></br>.gallery_header { color:#FFFFFF; }<br></br><br></br>.gallery_menu { color:#FFFFFF; }<br></br><br></br>.gallery_table { color:#FFFFFF; border:2px solid #FFFFFF; }<br></br><br></br>.gallery_section_bar { background-color:#303030; }<br></br><br></br>a.gallery_section_link_cell { color:#00FF00; }<br></br>a.gallery_section_link_cell:hover { color:#00FFFF; }<br></br>a.gallery_section_link_cell:active { color:#FFFF00; }<br></br>a.gallery_section_link_cell:visited { color:#FF00FF; }<br></br><br></br>.gallery_cell { color:#FFFFFF; }<br></br>.gallery_images_cell { color:#FFFFFF; }<br></br>.gallery_display_table { color:#FFFFFF; border:1px solid #FFFFFF; }<br></br>.gallery_display_avatar_cell { border-bottom:1px solid #FFFFFF; background-color:#303030; }<br></br>.gallery_display_title_cell { border-bottom:1px solid #FFFFFF; background-color:#303030; }<br></br><br></br>a.gallery_image_author_div { color:#00FF00; }<br></br>a.gallery_image_author_div:hover { color:#00FFFF; }<br></br>a.gallery_image_author_div:active { color:#FFFF00; }<br></br>a.gallery_image_author_div:visited { color:#FF00FF; }<br></br><br></br>.gallery_display_filler { background-color:#303030; }<br></br><br></br>.gallery_display_image_cell { background-color:#303030; border-bottom:1px solid #FFFFFF; }<br></br>img.gallery_display_image_cell { border:1px solid #FFFFFF; }<br></br><br></br>a.gallery_image_action_bar,<br></br>a.gallery_image_action_bar:active,<br></br>a.gallery_image_action_bar:visited { border:1px solid #FFFFFF; }<br></br>a.gallery_image_action_bar:hover { border:1px solid #FFFFFF; background-color:#303030; }<br></br>a.gallery_image_action_bar { color:#00FF00; }<br></br>a.gallery_image_action_bar:hover { color:#00FFFF; }<br></br>a.gallery_image_action_bar:active { color:#FFFF00; }<br></br>a.gallery_image_action_bar:visited { color:#FF00FF; }<br></br><br></br>.gallery_display_notes_cell { background-color:#303030; border-bottom:1px solid #FFFFFF; }<br></br>.gallery_display_details_cell { background-color:#303030; border-left:1px solid #FFFFFF; border-bottom:1px solid #FFFFFF; }<br></br>.writers_gallery_details_cell { background-color:#303030; border:1px solid #FFFFFF; }<br></br><br></br>.gallery_comment_table { color:#FFFFFF; border:1px solid #FFFFFF; }<br></br>.gallery_comment_header_cell { background-color:#303030; border-bottom:1px solid #FFFFFF; }<br></br>.gallery_comment_avatar_cell { background-color:#303030; border-bottom:1px solid #FFFFFF; }<br></br><br></br>.gallery_comment_body { background-color:#303030; border-bottom:1px solid #FFFFFF; padding:4px; }<br></br><br></br>.gallery_comment_divider_cell { background-color:#303030; border-bottom:1px solid #FFFFFF; }<br></br><br></br>a.gallery_comment_title_div { color:#00FF00; }<br></br>a.gallery_comment_title_div:hover { color:#00FFFF; }<br></br>a.gallery_comment_title_div:active { color:#FFFF00; }<br></br>a.gallery_comment_title_div:visited { color:#FF00FF; }  <br></br><br></br>.trailimagediv { background-color: #303030; color:#FFFFFF; border: 1px solid #FFFFFF; }<br></br>/* user style end */

You will want to use different colours as these where just for testing.