I'm currently maintaining a custom WinForm application, for one of my customers, which was made by me and using .NET but it has an issue, which it's that any product registered through the WinApp, OpenCart can't read the new record anywhere, I mean, neither inside the admin frontpage nor final customer frontpage, even being the new record in the DB, but if I register new product through OpenCart, obviously it's included and OC can read it!.
I have already checked all fields in the DB and it seems to be everything okay. I have also tried updating OpenCart (from 2.3 to 3.0.1, all fine, don't worry

it's worth mentioning that the WinApp can read and manipulate the data (from DB) without troubles, even when the WinAPP updates the old product records, OpenCart can see the changes but still without reading the new ones by the WinAPP. OpenCart is not able to read new records registered by the WinAPP. Simply as that it casues headache.

I have made a local enviroment: same OC version, same WinAPP version, etc. and all work fine, without issues!
I pray to god that you can assist me!
Many thanks in advance!