Title bug?

Hi,

I tried to install a subtile plugin unsuccessfully: it displayed HTML code instead of subtitles. After reading the FAQ, I found this:

There’s Weird HTML Showing Up On My Site!

I can almost guarantee that the reason this is happening is because your theme developer is using either the_title or get_the_title in places where they should not be used. This is a theme bug, not a plugin bug. When titles are used as attributes, the appropriate template tag to use is the_title_attribute, never the_title.

I don’t really understand what it means. Is it really a theme bug? Is it easy to fix?

Thanks,

Lotfi