Radio button displaying in two lines instead of one

Hello,

I added two radio buttons at the bottom of my contact form but their label is displayed in two lines while there is enough space to be displayed in only one line.

See https://samuelchopard.ch#contact > “Être rappelé”

I don’t know if this has any impact but I use WP Rocket for caching.

Thank you in advance for your help.

Kind regards,
Samuel Chopard