Bitmap layers not appearing when rendering final image sequence

I have an animation that’s mostly done in vectors, but with a couple of embedded imaged brought externally, pasted as bitmap layers. These layers are not appearing when rendering the final image sequence on PNG with transparency. They do appear when rendering with OpenGL, but this is not acceptable because I need to export with a transparent background.

Please help me!

Have you tried previewing them in Render View rather than OpenGL View before the final export?