On Opencart, there are goods in the admin panel, but not on the site, what could it be?

Question

CMS

most of the products are on the site, and some just do not appear, did everything
1. status on
2. SEO URL changed
3. sorting order was set to individual
4. publication date was also changed
5. deduct from stock - no
6. quantity set to maximum
7. in stores the goods are priced
8. in the categories marked

Answer 1

Transferred to a new engine?
Maybe not all the data was transferred for these products?
The easiest way is to compare with those products that are displayed, it is better to do this in my opinion in phpMyAdmin or a similar database tool.
First of all, look at the tables
product_to_store, product_description, product

Answer 2

check the correctness of the data in the tables, if there are no products in the admin panel either, then most likely the tables need to be restored.
and so something specific is difficult to say, we need at least logs