After update I can't see my building and other things inside my base what I must do ?

The game does have graphical glitches from time to time but they are normally resolved easily by closing and reopening the app. If you are getting the problem all of the time after an update then there may be an issue running on your device type.

It would be best to report this to the game developers. You can do this in game with the contact options. If you have trouble with this then check the support page for more ways to contact them/