Waste of money?

Love the watermark I designed on this app but it won’t let me save/export it. I’ve tried saving it to the desktop, a file, and the finder. Nothing. It saves FIVE pieces of the photo that end up looking like a gray box. I have a Macbook Pro running 10.10.5. Not sure if it’s me or the app. Ugh.

Fitzarelli about Watermark Plus, v1.5.6