Can't update the quantity of a product after migrating from 1.7.8.10 to 8.1.3

[snowstone]

Dear community,

I've recently updated my shop from the version 1.7.8.10 to 8.1.3. 

Right now I can't update the quantities of a product. When I save the new quantity I receive the message "Configuración actualizada" (Settings updated), but when I refresh the page the changes are not made, and the quantity goes back to what it was.

I deleted browser cache and also PS Cache from the Backoffice, and the console error is still there.

JQMIGRATE: Migrate is installed, version 3.4.0
460:7707 Found a 'popover' attribute with an invalid value.
460:7747 Found a 'popover' attribute with an invalid value.
content.js:2 Error: <svg> attribute viewBox: Expected number, "0 0 100% 4".
 

What could be the issue?

Thanks