How can I fix the issue of incorrect canonical tags on product pages?

Wrong canonical tags are added on all the main product pages linked from website

Eg:

Page Linked from website - https://kapdaa.com/collections/journals-classic-journals/products/classic-journal-cactus-print-on-black

Canonical Tag -

Every page has one duplicate page mentioned in canonical tag. This duplicate page which is not linked from anywhere in the website is there in canonical tag of ever product page.

How to resolve this issue