Images are shrinking in width after conversion to FrameMaker from DITA.

In a book I'm making I have 4 nearly identical images (charts) that are on landscape-oriented pages. The rest of the document is portrait. All 4 charts are 1419 px  X 1052 px. 

In the DITA, each chart is in its own topic.

The <fig> element has an output class that tells FrameMaker the landscape master page should be applied to it. This output class is referenced in reference page. 

Here is the DITA content of each topic:

Here is the converted content. Every time, the first three images are the same size (7" x 5.25")) The last one is smaller.(6.5" by 4.8 ") I cannot finde the reason. Here are the last 2 images: the first, is