Maxbutton doesn't work anymore…

Hello,

I have used the Maxbutton plugin for several weeks and it worked very well on desktop device (not on mobile device but this is another problem).
And since this week, it only shows a link and not a button

Here an exemple of a page with my button “réservez votre séance photo”: http://www.auroreleteve.com/portfolio-maternite/

Could you help me please because it’s very bad for my visitors….

Thank you,
Aurore

https://ww.wp.xz.cn/plugins/maxbuttons/