Elements are missing/ disappearing in my Illustration from my Illustrator file!!!

Hello

So i'm doing several illustrations from my city and in the illustrations there are elements that are disappearing, like the grades on the windows, the colors of the shoes changed to the color of the hair, but mostly is elements disappearing from my Illustrations, something out of the place too, at first i thought it was me who missed this and that but now i can tell you this for a fact, i was working on my second similiar window and the first one was empty just like that, as i was working.