The progress value for the task relating to obtaining certain amount of gold is store in the same place for each friend and main task. If you already have a task for obtaining gold and you get another one from another friend/main task, then your progress is reset, rather annoying. I'm unsure if this is the case for all tasks, as I've only taken notice of it with the gold ones.
Heya Shano1321. Yeah, this is a really frustrating bug. It will happen any time you get a new task of the same type. We are working on a fix for it and will patch it as soon as we can!
 "Idle Harvest"){kind=icon}
Heya Shano1321. Yeah, this is a really frustrating bug. It will happen any time you get a new task of the same type. We are working on a fix for it and will patch it as soon as we can!