Welcome to the forum, @fluffy 
I moved your post here because it was a similar issue and has more recent answers.
It looks like your save was not correctly saved. Are you using autosave, or did you manually save it?
Can you upload the savefile so that we can take a look? Just zip the folder corresponding to that save and upload it here. In this post there are some instructions on how to upload files if you need them.
Savefiles are usually located in C:\Program Files (x86)\Steam\steamapps\common\Stonehearth\saved_games