Hi Ever.
By any chance did you save these images with a transparent background to iOS Photos and then import them into Fresco directly from there?
If that was your process, it is a bug. And we're working on it.
The workaround is to either: 1. Bring the transparent-background image into iOS Photos AFTER having saved it somewhere else or 2. just bring it in from somewhere other than iOS Photos.
Let me know if that wasn't your work process.
Sue.