ReactJs Checkbox doesn't change value after first use

I have a large form with various form elements which is dynamically rendered from a get request. All other types of form (such as text and select) are working fine, however the checkbox is not.

After I check it once, it only stays on (even if I uncheck it), am I missing something or doing something wrong here?

Here is my current relevant code:

class Input extends Component{
    render(){
        var form;
        if (this.props.componentClass=="choice") {
            // select form
        }

        else if (this.props.componentClass=="bool")
            form =(<Checkbox id={this.props.controlId} onChange={this.props.onChange}
                               defaultChecked={this.props.placeholder} >
                        </Checkbox>);
        else
            // text form
        return (
            <div>
                <Form inline onSubmit={this.handleSubmit}>
                    <FormGroup controlId={this.props.controlId}>
                        <ControlLabel>{this.props.name}</ControlLabel>
                        {form}
                        <Panel>
                        {this.props.description}
                        </Panel>
                        <FormControl.Feedback />
                    </FormGroup>
                </Form>
                <br/>
            </div>
        );
    }
}

// onChange code (comes from a parent component)
    onChange(e){
        const form = Object.assign({}, this.state.form);
        form[e.target.id] = e.target.value;
        this.setState({ form });
        console.log('current state: ', this.state);
    }