Vitals - Visitors replay shows code in collection page

Hi,

I’d need some help please.

I’ve installed the app Vitals to learn from customer behaviour.

I noticed that when they click on the collection page, or they coming from fb ads, I can see code in my collection instead the products.

now, I don’t know if is only an issue from Vitals showing that or is really happening to customers, so losing sales.

I tried from my devices and it works perfectly.

thank you