This could be caused by a variety of reasons. But usually, in my experience, it tends to come from an app that is causing an issue with your theme. Could you provide me a link to the product page that is giving you the issue?
Also, to test this out yourself, preview that product page from a different theme (install a fresh copy of a free Shopify theme) and see if the issue can be replicated.
If there is anything else I can help you with, please let me know.
Hi Drik and thank you for replying,
All products are affected, and I'm pasting a link as an example her. Try to add one more item to the cart and you will see that the price will be 10 times higher instead of doubling.