React JS Custom Component Animation

I have a ReactJS component that looks like this:

import React from 'react';

class Circle extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            error: null,
            isLoaded: false,
            percent: null
        };
    }    

    componentDidMount() {
        const url = "base url here" + this.props.endpoint;
        fetch(url)
            .then(res => res.json())
            .then(
                (result) => {
                    this.setState({
                        isLoaded: true,
                        percent: result.percent
                    });
                },
                (error) => {
                    this.setState({
                        isLoaded: true,
                        error: error
                    });
                }
            )
    }

    render() {
        return (
            <div className={"col-md-" + this.props.size + " progress-circles"} data-animate-on-scroll="on">
                <div className="progress-circle" data-circle-percent={"" + this.state.percent + ""} data-circle-text="">
                <h4>{this.props.title}</h4>
                    <svg className="progress-svg">
                        <circle r="80" cx="90" cy="90" fill="transparent" strokeDasharray="502.4" strokeDashoffset="0"></circle>
                        <circle className="bar" r="80" cx="90" cy="90" fill="transparent" strokeDasharray="502.4" strokeDashoffset="0"></circle>
                    </svg>
                </div>
            </div>
        );
    }
}

export default Circle;

So far, this works like a total charm. The only problem is that there's an animation associated with this element that fills in the progress-circle and it doesn't occur after I've set the value from the componentDidMount function. The animation does occur if I set the value via props from the parent component. Am I missing something? I'm new to React so it could be something simple. Thanks in advance!