This is interesting. Are there conflicts with other graphics perhaps?

If it helps you troubleshoot, I encountered a similar problem recently. It was creating document cleanup macros for a document conversion suite. The original graphics were improperly anchored. My goal was to convert them to inline shapes as it was not necessary for them to float. Something strange happened and I did not chase it fully because once identified, I took the path of least resistance.

The strange thing was that even after changing the shape to become an inline shape, and even after cutting it out of its original anchor to another document, and pasting it back in as an inline shape, I found the original anchor paragraph marks (no longer an anchor at this stage) were causing the problem. As long as that inline shape was pasted into the original anchor, the result was similar to what you see (graphic truncated - with only a sliver visible. In my case users are cleaning up documents, so it wasn't not necessary to chase it further. My shape conversion macro puts it into a new virgin paragraph, and users delete the original anchor paragraph mark, if empty.

In your case, if it is the same problem, you may need to do something with the anchor paragraph, maybe reset it, idk.