Dell U4924DW 49" monitor

Hello, when I connect my laptop with a USB-C cable to this monitor, my mouse is not responding properly and it presses the space key and arrow key constantly. So when I open my mail for example, I scrolls down to the last mail like crazy. Although I do not press anything. I tried updating the firmware, another UBC-C cable and another laptop. I also installed the Dell Display en Peripheral Manager. Nothing seems to work. Anyone with the same situation?