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Welcome to the forum. When you say roll back, is it not saving your progress? Why are you refreshing? Do you mean when you come back to the game, I find I wait for 5 mins before I close to make sure the game catches up with saving.
Here is a link to do's and don'ts playing on web : https://zyngasupport.helpshift.com/a/farmville-2/?p=all&s=technical-help&f=what-are-the-do-s-and-don-ts-when-playing-farmville-2-web-game&l=en
and here for technical informationhttps://zyngasupport.helpshift.com/a/farmville-2/?p=all&s=technical-help
Support contact : https://zyngasupport.helpshift.com/a/farmville-2/?contact=1
There are times if in game a while you do have to refresh or such to update page perhaps before a task about to do.
It has happened with some instances a lot.
You may have to contact support to push you through and say you have done it a good few times
Perhaps visit a neighbor and return to farm
Could be an issue with task doing
If have a main bug post in this link
Link to Supporthttps://zyngasupport.helpshift.com/a/farmville-2/?contact=1