I lost all my progress suddenly,whats happening???

I didn't login just for one day, and all my man have gone....

In the web version of the game the save files are stored in the cache of your browser. If you or your browser clean the cache then they are removed. The is an option for download/import save files in the management tab. It helps for do manual backups

Thx for the reply, apparently the phone clean up function clean all the cache...

I did saved the file, but still I lost one week of progress 

It's fine since I love this game ~