I went to another computer with different software and it did the same thing. I copied and pasted the findagrave reference under Thomas Weller's profile (which is the same link and which shows up just fine on the profile page) iinto the comment box under the image - and IT DID THE SAME THING.
It is not something I am typing - it is something to do with the comment box. Hope a techie can unscramble this:)
I deleted the whole comment and started with a fresh comment box and copied the source from the profile page into the comment box under the image, and it did the same thing.
I have often copied sources into comment boxes under images, to properly source the image, and this has never happened before. I think there is a gremlin in the works.