Odd greyscale behavior when drop-shadow is applied.

I have a file with four images in it. One is RGB and three are greyscale jpeg images. They all look fine.
Now, when I put a drop-shadow effect on the images, the RGB image looks as expected; but, the greyscale images all look lighter than before.
I exported a PDF of the two pages (I made a duplicate so one page has the shadow and one does not) with the PDF-X/1a profile. All of the greyscale images look lighter, even the page without the shadow, which looks darker in InDesign. The RGB image looks the same on both pages an in the PDF.
Why do the greyscale images look lighter when a drop-shadow is applied? Or, maybe a better question is, why does the image without the drop shadow look darker? (The darker image looks more natural. I opened the Greyscale images in both Apple's Preview and in Photoshop. Preview displays the nicer-looking darker image, but Photoshop shows the images as being lighter, the way it looks in the exported PDF.
Any ideas?

Thank you for this interesting discussion.
I set the Transparency Blend Space to RGB* and now all of the grayscale images look the same. They have all taken on the darker appearance. Until, of course, when I turn Overprint Preview on, in which case they all get lighter. In Photoshop, the image seems to be in-between the light and dark looks in ID.
You know, up until today, I was feeling pretty good about color on the computer, thinking all the problems of the past were behind us. Oh well!
Anyway, I have another question about Transparency Flattener Presets. It is set to Low by default in ID. I suppose this is to speed up rendering time. Now, when I export to a PDF there is a Transparency Flattener setting there, if the PDF is an X-1a file. In that case, does ID ignore the setting in the file under the Edit menu?
Also, I set the Transparency Flattener Preset in ID to High, but it always returns to Low when I check again. Why is this? (The Low, Medium, and High settings are surrounded by brackets, like this: [Low]. Does that mean anything?) So, what  does the Transparency Flattener Settings affect? A print made directly from the file? The preview in ID? I thought I had all this down, but now I am a little confused.
*(BTW, this piece will be used as an outdoor poster on a kiosk and the media company has requested an RGB JPEG file, so I will be exporting this as a PDF-X/4 and then opening it in Photoshop before saving it as a JPEG. So, I know, the best thing to do is to convert the grayscale images as RGB files and maybe even adding a little tint, perhaps. But I am still curious about the other questions.)

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