Images are being cropped at the bottom…

I have a problem. I use the plugin ‘circle image slider with lightbox’ to display my work in my portfolio. I have adjusted the settings (both in the settings menu and in the css-code) to my liking, but one last problem remains: the circular images are being cropped at the bottom. This has been a problem since the beginning, even before I started adjusting settings. What I have tried to fix it:

– uncheck the box in settings -> media -> adjust to settings (don’t know if this is the exact translation, I use wordpress in Dutch)
– make the images smaller or bigger
– adding a border to the images (didn’t help, I do like it however so I’ll keep it)

This all didn’t help. I hope you’ve got a solution for me, thanks in advance!!

Link to the page: https://tuttifrutti-producties.nl/index.php/portfolio/