Command/Control keys are split on PC keyboard with Mac
Please note that &lt;Ctrl> on a "PC" keyboard is the same as &lt;CTRL> on a Mac keyboard.  Normally on a Mac you would need to use &lt;Command>-C for copy, not &lt;CTRL>-C.

Note that on a PC keynote &lt;Alt> and &lt;Command> keys are normally reversed. Maybe this is what you are trying to fix via the Modifier keys in the keyboard control panel?

Below is the mappings hatI have for his exact configuration: