Strange layout on Classifieds page

Hi there
I'm configuring the Classifieds plug-in, and have altered the labelling using Custompress to read "Advert/Adverts" instead of "Classified/Classifieds". But in doing so the layout of the table of the /classifieds seems to have changed. The individual listing page is OK though. I attach two screengrabs to illustrate... Have I done something inadvertently?