Collections showing as empty when the page finishes loading

Hi all. I’ve recently tweaked my collections so I have multiple colours in one collection rather than a huge list of colours, i.e grey, black and monochrome. I have just noticed that the products in these new collections show up when you first open the page, however after 10 seconds or so, when the page is finished loading, it changes to ‘this collection is empty’. Can anyone shed some light on why it might be doing this please? Thank you.

I’m not sure if this helps but I’ve noticed the url changes from https://www.biglittlebedrooms.co.uk/collections/grey-childrens-bedroom-and-nursery-lampshades/lampshade to https://www.biglittlebedrooms.co.uk/collections/grey-childrens-bedroom-and-nursery-lampshades/lampshade?view=no-usf what is ?view=no-usf ???

Could it be to do with some code I paid an expert to remove that was left over from some apps I deleted? Maybe he made a mistake?