React-dnd: Custom Drag Layer Shows both HTML style and Custom Layer

Hi there, I have an issue where my custom drag layer is rendering both with my custom and HTML defined style. At the same time I am being warned that "setState cannot be called during an update transition".

Here's my code:

import React from 'react';
import PropTypes from 'prop-types';
import { DragLayer } from 'react-dnd';

import ItemDragPreview from './ItemDragPreview';

const layerStyles = {
    position: 'fixed',
    pointerEvents: 'none',
    zIndex: 200000
};

function getItemStyles(props){
    const {initialOffset, currentOffset} = props;

     if (!initialOffset || !currentOffset) {
        return {
        display: 'none'
        };
    }

    let {x,y} = currentOffset;
    const transform = `translate(${x}px,${y}px)`;
    return{
        transform
    };
}

class CustomDragLayer extends React.Component{
    static propTypes = {
        item: PropTypes.object,
        itemType: PropTypes.string,
        initialOffset: PropTypes.shape({
            x: PropTypes.number.isRequired,
            y: PropTypes.number.isRequired
        }),
        currentOffset: PropTypes.shape({
            x: PropTypes.number.isRequired,
            y: PropTypes.number.isRequired
        }),
        isDragging: PropTypes.bool.isRequired,
    }

    renderItem(type,item){
        return (<ItemDragPreview ruleitem={item}/>);
    }

    render(){
        const {item,itemType,isDragging} = this.props;
        if(!isDragging){
            return null;
        }

        return (
            <div style={layerStyles}>
                <div style={getItemStyles(this.props)}>
                    {this.renderItem(itemType,item)}
                </div>
            </div>
        );
    }

}

let collect = monitor =>{
    return {
        item: monitor.getItem(),
        itemType: monitor.getItemType(),
        currentOffset: monitor.getSourceClientOffset(),
        initialOffset: monitor.getInitialSourceClientOffset(),
        isDragging: monitor.isDragging()
    };
}

export default DragLayer(collect)(CustomDragLayer);

Here's the warning:

Warning: setState(...): Cannot update during an existing state transition (such as within render or another component's constructor). Render methods should be a pure function of props and state; constructor side-effects are an anti-pattern, but can be moved to componentWillMount.

I'm wondering if this is an error on my end or on the end of the library.
Thanks!