what is your forum url and which theme you are using ?
revoken-gaming.eu and I use Flatty theme
adding images in forum description has disturbed the width of forums section.
you may try adding below style property at the bottom of
global.css of the theme
(edit in
advanced mode &
hard refresh your browser on
forum index page after saving
global.css)
img[src*="server_info"] {width:280px!important;}
^ when you added suggested code, extra character  was added twice. delete that & save global.css
change img[src*="server_info"]Â {width:280px!important;}Â
to img[src*="server_info"] {width:280px!important;}