You are definitely not the only one having this issue. I have an Arcology under construction that routinely, during the same session in the same city, will go from 100% completion of TVs to suddenly only 25% completed. It will then vary for the entire time. I even had one city give me the little check-mark for completing alloy to the site, then immediately the site indicated I had only delivered 150/1000 alloy.
Very confused.