Flip Box Title not centered

I’m using flipboxes in my website, displaying only a title in the front and a description in the back, without any icon.

The problem is that I am using the ‘center alignment’ option, but the alignment of the title is still not centered, but goes towards up. The description in the back is correctly placed instead.

I tried to:
– change alignment
– regenerate assets
– clear cache
– clear minified JS/CSS
– deactivate cache plugin

but the problem still persists

The page I need help with: [log in to see the link]