Currency errors depending on launch source

Hi.

The website is built in Flatsome with Woo and the Price by Country plug in. The pricing is multicurrency such that a UK person sees the product in ￡ and a US person sees the product in $. In general this works fine with some errors occasionally that are not easy to reproduce. However, when the site is launched from Facebook or Instagram the store appears in $ on most occasions regardless of location.

The pricing then reverts back to the correct currency when you click on a specific product.

The site is using detect country from IP in the Price by Country module. Maxmind is also enabled through the Woo settings.

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