有些 (yǒu xiē) has two uses: as a pronoun it means 'some (of something)', similar to 有的 (yǒu de) but more general — 有的 is often used to contrast groups (e.g., 有的人...有的人...). As an adverb it means 'somewhat, a little', like 有点儿 (yǒu diǎnr), but 有点儿 often implies a slight negative feeling, while 有些 is more neutral.