This was posted to me in a private message.
Update. So I went back to my post and deleted the pictures and reinserted them WITH captions. Then scrolling down the thread, I opened the next picture posted and it had the caption for the last picture I posted. So it seems that the caption is sticky until someone enters one on another photo. Farther down, there's a photo I think by Martin that has no caption, so I don't know what's going on there, unless he entered a space for the caption of that picture, which I doubt. Then farther down, Tuts posted a couple pics with captions, then Martin posted another which got the caption from Tuts' last photo.
So, it appears that, if an image does not have a caption, it displays the caption from the last image that did have a caption.
Is this by design?