Mouse pointer is lying and DPI is changing?

My mouse pointer and my DPI always lie when I start something / play games.

For example, my DPI is extremely low in Fortnite, sometimes I can't move at all.

For example, if I want to play Minecraft I start it via the Avira Game Booster then these laggs are not there anymore. But unfortunately I can't add a Fortnite.

Currently I have the Razer Deathadder 2013 but it is the same with other mice.

I also tried to delete the mouse in Device Manager, but the problem was still there.

Maybe the mouse pointer sensitivity multiplier is different in your games? Each game has its own mouse sensitivity levels that you can change.

It is true that the DPI times extremely low, then I can't turn around and sometimes it is high, then normal, then it stutters

Sure it is not a defect in the mouse itself? Connect it to another PC.

I have made. There were no Laggs but when I connected a new mouse to my PC, it did not work again