When you save a favorite brush with the 'hard edges' ticked, it works properly and every time you click the preset, it has hard edges ticked.
Except, when you close out of the app and go back into it, it loses this info, and if you select the preset, it will un-tick 'hard edges' and the edges will be soft. So you have to tick it again and re-save it to favorites.
Pretty small bug I know, but hopefully that means easy to fix. Keep up the great work yall its a really great app