Is my Deathadder v3 Broken?

I was playing Rainbow Six Siege with the mouse and I felt it was a bit jittery, the aim I mean so I went and checked the Razer Synapse App to see the polling rate, it was set to 1000hz so I went ahead and tried to check it online, whilst on 1000hz set in synapse, on the browser or even the razer polling rate test it was reading 125hz max. If I set in synapse to 8000hz, only then the razer app for polling rate was reading 1000hz, something is wrong with it. 

Note: I had a pulsefire haste 2 from hyperx before, it could also go up to 8000hz polling rate but I never got wrong readings on that. Something feels off on this one, the aim is jittery, I am afraid the mice got a mismatch on polling rate values.

I tried changing the USB port, updated firmware, everything. I don’t know what to do anymore