Every old file opens when starting Textastic

This was fixed in a previous update but when I updated to OS 10.14.6, it's back. Whenever I open Textastic, it opens every old file I've edited over the past month. It's getting to the point that it takes me a few minutes to close them all out. I have this option deselected in preferences but it's still happening. I really enjoy Textastic but this is a killer. Help!