Here is an excerpt from a book review by Peter Campion in the December 2009 issue of Poetry:
Whatever their derivation and however they operate, the groups of ideas in whose light the best poets perform their work are what make their poems so often feel estranging. This is because those ideas, taken together, form a wholly original view of life. We encounter and explore these views as if learning new languages, by immersion. The habits of perception in a newly discovered poet’s work are so unique that they often force us to break down our own pre-conceptions and learn the world afresh.
If a poet has a "wholly original view of life" it should not be surprising that her poems might come across as pleasingly ambiguous ("temporarily baffling") on a first read (or perhaps even on many reads).