React-Bootstrap Horizontal Form not working

I am trying to create a form using react-bootstrap, and cannot figure out how to use the horizontal Form layout. Below is my code for signin.js.

import React, {Component} from 'react';
import {reduxForm} from 'redux-form';
import {Form, FormGroup, FormControl, ControlLabel, Col, Button} from 'react-bootstrap';

class Signin extends Component{
    handleFormSubmit({username,password}){
        console.log(username,password);
    }
    render(){
        const {handleSubmit, fields: {username,password}}=this.props;
        return(
            <Form horizontal className="col-sm-6 offset-sm-3" onSubmit={handleSubmit(this.handleFormSubmit.bind(this))}>
                <FormGroup>
                    <Col componentClass={ControlLabel} sm={2}>
                        Username:
                    </Col>
                    <Col sm={10}>
                        <FormControl {...username} type="text" />
                    </Col>
                </FormGroup>
                <FormGroup>
                    <Col componentClass={ControlLabel} sm={2}>
                        Password:
                    </Col>
                    <Col sm={10}>
                        <FormControl {...password} type="password" />
                    </Col>
                </FormGroup>
                <FormGroup>
                    <Col>
                        <Button type="submit">Submit</Button>
                    </Col>
                </FormGroup>
            </Form>
        );
    }
}

export default reduxForm({
    form: 'signin',
    fields: ['username','password']
})(Signin);

This is how it is rendered in app.js:

import React, {Component} from 'react';
import {Route} from 'react-router-dom';
import Signin from '../auth/signin';

export default class App extends Component{
    render(){
        return(
            <div>
                <Route exact path="/signin" component={Signin} />
            </div>
        );
    }
}

This is how it renders onto the page I want both of the labels to be inline with the text fields. I have gone over the react-bootstrap docs multiple times. I have copy and pasted their example code for a horizontal form into my code, and it still renders similarly to the image above. Any help would be greatly appreciated. Thanks!

EDIT:

This problem was caused by linking to v4 of bootstrap in my html, linking it to v3 fixed it.