Luban not working properly with my stl CNC files?

Ok so not the best description for a title of my problem but in a nutshell when I open an stl file in cnc the model shows patches of black lines and dots and also gray lines through it almost like pixelating?? Does this with every file. I can open the file in Fusion 360 no problems as well as other software but unfortunately I am not sure how exactly to work with fusion 360 other than to open the file - after that I am lost, I will have to watch some videos to figure it out but I just would like to know why Luban is doing this or if anyone else is experiencing the same thing. I have version 4.73