Errors Continue Occur To My Farmville 2

I have had many errors on my farmville 2 game, such as I expand the land already but the next time I logged in , it dissapeared but the money I spent on it did not come back. Another time I did some decorates on my farm and it also dissapeared I a logged back in. This time I finished a few quests, one of them is feeding the deer, but my deer is not in my farm any more and I could not find it anywhere. Please help me to solve these problem.