Item with the same ID "275" already exists.

[Balex70]

Hi, I have a weird issue!
In Magento 2.3.7 installation with a lot of 3-party modules installed. Need to try out grid in admin, but after:

• Copied your module to app/code
• bin/magento setup:upgrade

I got this message on admin page and system.log
"main.CRITICAL: Item (Magento\Framework\View\Element\UiComponent\DataProvider\Document) with the same ID "275" already exists"

Can you guide me on where to dig in?
Thanks