Resizing of pictures

When I drag a large scale pictures from LR into Fotomagico it’s scaled to 133% and its size shows 1440x920 px. I understand the scaling, since it’s fitted to the screen, but I think FM imports the preview files instead of the original file.
When I drag the same file again on top of the previous, it imports with the original size…
This is a very unsatisfying behaviour…
Did anyone experience the same problem? I’m still using Yosemite and not willing to upgrade yet, but I don’t think that’s the problem…