Filter only showing 1 product instead of 100’s

I’m hoping this a super simple issue to sort. On this page (https://gamedaygifts.co.uk/product-category/product-type/football-shirts/) the filter is only showing 1 product but there are 100’s in the category. To fix this click on the Arsenal filter twice then, hey presto, all the filters appear. Really strange as I haven’t touched the filters for months. Any know what’s going on here?

Thanks

Liam

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