We have noticed a discrepancy in the number of products for collection ‘All’ mentioned in /admin/collections, and the actual number of products available to end users on the /collections/all page.
We are seeing it on almost 15 stores we’ve built. In total the difference is 7058 products.
Here are screenshots from one of the stores:
Calculations 13310 - 12625 = 685
Admin:
/collections/all page:
So, the questions are - What the possible reasons? And how we can prevent this difference?

