Before the big update back in 2017, Illustrator's paths were very accurate in terms of using pathfinder tools and intense zooming in. I'm not sure what the new updates were, but it's frustrating.
Attached are screenshots of what I'm talking about. I punched 2 objects (namely black colour and green colour), using the exact same ellipse that I copied and pasted in front. I used to do this all the time, but with better results. Now it's as if it purposely goes out of the accuracy it once had. I'm zoomed in all the way with these screenshots.
Please accept my sincere apology for the inconvenience. Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
Thanks & Regards,