Problem visualizing/importing CGI

I've been having this weird issue from a long time ago, and I'm not sure what causes it. I work time by time with renderists and 3D artists for ad projects, and I tend to use some images generated in C4D, 3D MAX and Maya. But no matter what program, model or file size I get, everytime I try to import my PNG on my artboard it looks with a "glitchy" texture, and the only way to sort it out is by opening my file on Ps and save it as a PSD, then importing back to Illustrator (which is way more larger in size than a PNG). I've tried asking my coworkers to export their files with different settings, but it always look the same once I open them on Illustrator. Any ideas?

I attach the view of the PNG files as a normal preview, and then, the way they look once I import them on my Ai file. This is my info:

Illustrator version 25.4.1 

macOS Mojave version 10.14.6 (18G95)

iMac (Retina 5K, 27-inch, 2017)

3.4 GHz Intel Core i5

24 GB 2400 MHz DDR4

Graphics Radeon Pro 570 4 GB