Products showing to wrong vendor in 4.3 version

Version : 4.3
database: SQL server 2019 Express (free Edition)
Vendor: 10+
Total products : 13k

from last few weeks we are facing strange problems given as bellow.

1. ABC vendor listing products but after some time products automaticity showing to another vendor account.

2. ABC vendor have total 7600 products listed. Vendor not adding or remove any listing but after few hours we seeing total 7605.

We are planing to upgrade latest version 4.4 but not sure this problem has been solved for 4.4 or not.

Do you know how to use SQL?  Query the DB table to be sure it's correct there:

select VendorId from Product where Id = ...