Dell D3100 Monitor Zoom kaleidoscope
 

I bought a Dell D3100 and having trouble. When I use the monitor Zoom (Macintosh Accessibility system preference panel setup), my monitors zoom in, but leave a kaleidoscope trail. This only happens on the monitors connected to the Dell 3100. My iMac monitor still works perfectly. Can this be fixed? I have a 2017 iMac 27" 5k monitor. Thanks