Hi Mike,
That has to do with the default mapping of that object.
If you are trying to map the image 1:1 on the plane without any tiling and fitting exactly to the plane, I'd suggest using the HDRI Light from the toolbar:
SU HDRI Light .png
In this case, it will fit exactly to the plane (Option A in the image below).
On the other hand, if you want to edit the mapping, you will have to save a copy of the hdri image in a format that SketchUp can read (like jpg or png); this way, you can apply it to the SketchUp material so you can see it in the viewport (Option B in the image below), as SketchUp cannot view HDRI images in the viewport; then right-click on the plane, locate Texture entry > Position
SU HDRI Light mapping options .png
You will get to the texture positioning tool from SketchUp:
SketchUp texture positioning.png
Cheers!
Fernando
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