Hacked?

A client of mine is reporting that when sharing their articles to Facebook using your plugin, all of a sudden it will show that it is being posted by WhytoShy??? I viewed their Facebook Page and that does not appear for me, it just says their post was edited. I myself shared one of their website articles using the social media plugin to Facebook and it did post stating the post was made by WhytoShy. What is going on? This just started occurring very recently. Website: http://www.dinapariseracing.com Screenshot of problem: http://dinapariseracing.com/wp-content/uploads/IMG_0684.png

https://ww.wp.xz.cn/plugins/social-share-boost/