Link variant buttons on website product page to images & prices

Hi,

My website https://www.thesmallhome.co.uk/ uses the below theme

https://themes.shopify.com/themes/grid/styles/light

The product pages are set-up to have variant buttons but unfortunately they are not linking to images or prices (see the example below, when you click on the different sizes the price and images do not change).

https://www.thesmallhome.co.uk/products/uashmama-paper-bags-parchment?variant=32600627871804

I am looking for someone to link my variants to buttons.

Thanks,
Ayshea