Upvote:2
Not sure why you were paroled and not admitted given that you have a valid visa. Generally, you should be able to travel back to the USA given that you meet all other entry conditions. A parole stamp indicates that you were allowed into the territory of the USA without being admitted. In the eyes of the law, you were always at the border awaiting a decision on admission. Here you'll find a link which gives a more in-depth look into the legal meaning of parole in US immigration law.