Some images showing as attachments, not thumbnails

I've created a test thread on my forums, where I uploaded five images and inserted them all as thumbnails. On my site, some thumbnails show up, but some show up as attachments. They are all .png files. When I do the same test with the same images here at XF, they all show up as thumbnails (as they should).

These are my Options > Attachments settings.



Suggestions?

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