Gallery not displaying properly

Hi, having a problem with the gallery on my website. Here’s the link…

https://ltfc.ie/index.php/town-bow-out-of-ea-sports-cup/

When you click on the picture, it’s opening up in the same window, rather than as a gallery. The settings for the gallery are as standard, with ‘Link to media file’ selected.

Even the icon where the gallery should be is as a grid, rather than a photograph as per the default setting. Not sure why this is. Can anyone help?