[Plugin: MaxButtons] Buttons only visible as hyperlinks

Hi,

I am using the plugin Max Buttons on my homepage.
To organize them I’ve put them in a table using the Tablepress plugin.
When I’m logged in as admin the buttons are displayed and work but visitors only see hyperlinks instead of the buttons.
Can someone point me towards the solution of this problem?

Site in question: http://www.kocasecundaironderwijs.be

Thanks in advance!