Glad that you like the game. It's always nice to hear when people do.
There has been plans for that to be added.
What the subscriptions does is to give you early access to the newer versions of the game and FurryDesirer's other content. The 5$ gives you access to one update ahead of public and the 10$ to two ahead. The full version of the game is quite a bit away as there is a lot of things that want to be added and fleshed out.
I can think of two reasons something like this could happen. Either it's from dropping the new version on top of the old to kind of update it. It's always better to delete the old folder completely and run the new version fresh.
Or it could be running an old save in an update that needs you to start over and run a new game.