Good Composite, Bad Writing?

I recently took the February 6 ACT with writing and did well overall (32 composite) but I got only a 19 in the writing portion. Will colleges look at this as a major weakness, and should it merit retaking the whole test? Also, if I should retake, any tips on how to nail the essay? I know I am not a bad writer, I think I really just misunderstood what they were looking for. Thanks!

@areyoupressed - read the thread under this:http://talk.collegeconfidential.com/act-preparation/1861583-act-essay-scores-inexplicably-low-says-washington-post.html#latest