Problems with images shrinking on export

Hey everybody! I am a super noob with Motion 5, but I love it already! I ran into a problem, however. I made my first lower third for a small video I am making from my holiday weekend but whenever I import it into FCPX as a generator or send to Compressor, the image shrinks. It's maddening, I tell you! I attached some screenshots. Any help would be greatly appreciated. Thanks!

P.S. The footage is 4k if that matters.

Don't see screen shots. Exactly what is shrinking? Elements inside the image frame? The whole image frame size itself? Text is shrinking?

Why not create it as an FCPX Titles Template, rather than a generator, and have more flexibility?

Its an image that fades in and out along with a layer of text. The text doesn't change but the image shrinks behind it. I guess I could try to create it as a FCPX Titles Template and see if that works. And, here's the screenshot...forgot to hit "insert" hah.





...screenshot won't upload for some reason, I dunno. It's only 4 MB and it's a PNG. Also tried JPEG. FCP.CO just isn't letting me insert it.

4MB is huge, you can't upload images that large here.

Are you using any sort of shape mask on that image?
Look in the Inspector, Properties, and when you play it back, is the Size parameter moving at all?