Why does the Twitter icon on my bookmarks bar keep changing to match that of other websites?

Why does the Twitter icon on my bookmarks bar keep changing to match that of other websites when I click on the other websites' icons to leave Twitter? For example, at the moment it matches the Yahoo answers icon. It only looks like the Twitter icon after I click it, which defeats the purpose of having an... show more Why does the Twitter icon on my bookmarks bar keep changing to match that of other websites when I click on the other websites' icons to leave Twitter? For example, at the moment it matches the Yahoo answers icon. It only looks like the Twitter icon after I click it, which defeats the purpose of having an easily identifiable icon.
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