No text on images

Hi,
I am a bit confused as no text appears on my main images that links to my portfolios. As you can see on the page https://www.louisbontemps.com/portfolio/category/reportages/.
I ticked the option to have the title displayed in the settings of the plugin and yet it doesnt work. It might be caused by the tweeks I applied to my theme.

Can you help me get these titles displayed?

Thanks

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