React native, children of ScrollView wont fill full height

So I have a horizontal scrollview at the top of the view. The ScrollView contains nodes that have a specified width. I then have a border on the bottom of the ScrollView, like you can see in this screen cap: https://i.sstatic.net/zcvDj.png

As you can see the child nodes of the ScrollView at the top don't reach the border. However, if I change the ScrollView to a View with flexDirection: 'row', then the child nodes fill the height fine. I've tried changing a few properties on the scrollview, such as:

• Setting padding:0 on contentContainerStyle
• automaticallyAdjustContentInsets={false}
• Changing the values of contentInsets directly

None of those seem to fix the issue.

The scrollview code & style:

var styles = StyleSheet.create({  nav: {    padding: 0,    marginTop: 30,    flex: 1,    borderBottomWidth: 1,    borderColor: '#000000'  }});<ScrollView  style={[{width: screen.width}, styles.nav]}  horizontal={true}  showsHorizontalScrollIndicator={true}  automaticallyAdjustContentInsets={false}>  {dayNavItems}</ScrollView>

The child components (makes up dayNavItems)

const styles = StyleSheet.create({  container: {    paddingLeft: 15,    paddingRight: 15,    width: 50,    justifyContent: 'center'  },  odd: {    backgroundColor: '#ccc'  },  selected: {    backgroundColor: '#39b54a'  },  text: {    fontFamily: 'Optima'  }});class DayNavItem extends React.Component {  static propTypes = {    day: React.PropTypes.object.isRequired,    odd: React.PropTypes.bool,    selectDay: React.PropTypes.func.isRequired,    selected: React.PropTypes.bool  };  render() {    const d = new Date(this.props.day.created_at);    const viewStyles = [styles.container];    if (this.props.selected) {      viewStyles.push(styles.selected);    } else if (this.props.odd) {      viewStyles.push(styles.odd);    }    return (<TouchableOpacity style={viewStyles} onPress={() => this.props.selectDay(this.props.day.uuid)}><View><Text style={styles.text}>{getMonth(d)}</Text><Text style={styles.text}>{d.getDate()}</Text></View></TouchableOpacity>    );  }}