Hello and Welcome to Just Answer my name is Lachard.
I have a couple of questions first have you ran the latest update in app store for Farmville. If you have their is actually a fix it section from Zynga that will specifacally look at your account and hopefully fix your issue. To use this you will have to have a Facebook account please let me know if you have any further questions I will be more than glad to walk you through it. This is the website. https://www.zyngaplayersupport.com/article/farmville-2/My-quests-are-missing-en_US-1448895174682
It says quest but that is just a template the fix it takes you to your account and they will work on your specific issue.