Thanks @maclaren93 Unfortunately, going back to title doesn't help, because it immediately autosaves and recounts the offline time. However, I switched to Chrome instead of Firefox and keep using the import save instead of autosave to make sure nothing goes wrong. Have been doing this for a few days now, and so far it works. @junior555 maybe you can try it.
I guess this game is meant for touchscreens, and it is indeed a nice game for that, but it absolutely isn't suited for PC. Having to "touch and swipe" with the mouse really hurts the hand..
 "Your Chronicle"){kind=icon}
 "ZS Dead Detective - Pumpkin Dead"){kind=icon}
 "Unpuzzle"){kind=icon}
 "Animation Throwdown"){kind=icon}