Browser-enabled forms do not look exactly like rich client forms, because Forms Server is converting the form to aspx code for web rendering and not everything translates perfectly. There are actually many things you have to learn to work around in regards to table/cell sizing, shapes, fonts, and functionality. Even data connections work differently in some cases, such as with dropdown lists connected to a SharePoint list where the rich client sorts in the same order as the list, but the browser sorts by ID always.