It looks as though there is some styling being stored with these details. Since not all of them have the styling applied evenly it looks like there is specific styling used on the ones that you see as bold.
Like Sades noted if you have added these values or edited them with iRite or HTML Editor then you can add in styling like this. If you view the source on the page what do you see for these entries on the page? There should be some styling that is different for them. If you can't identify it you can post back with a link to the page so we can take a look.