I am not totally understanding what you are saying. But do you think you have the switch wired correctly but it is sending power pressing the off position and cutting power pressing the on position?
If that is the case there are a couple of possibilities. The first is to make sure you have not installed the switch upside down. I’m going to guess that you haven’t, and that the LED bar is on the right hand side.
The second possibility is that you have parameter 11, invert switch, turned on.
On the other hand, I’m wondering if you have a non-neutral. I don’t understand how you can test for different voltages, as you should be testing with the wires disconnected, which obviously means you can’t turn the light on and off, if this is a 2-way.
Is this switch in it’s own box or in a multi-gang box?