Why did the default colors and fonts change when I moved a section of my email?

Templates have global styles (which apply to whole areas of the email, like the body or the header) as well as individual styles (applicable only to the particular block/section). If the block/section level styles are not defined in the templates (in this case, if you move a block/section from one area to another) and that second area has a different set of global settings, then the default colours and fonts