Why are my text frames wrapping??

Greetings smart people:

The text frames in this document are mysteriously wrapped and I can't figure out why. When I click on the text frame, I see the frame wrapping, as in "Text frames wrapping.jpg" attached. I've check the Parent pages and there is no text frame in any of them.

The text thread begins on a page that includes a wrapped image, and the text frames on the following pages automatically had the same wrapping dimensions as the image (although the text frame on the first page didn't have the wrapping). I don't think the first page text frame itself was wrapped at any point, just on the pages following.

To see what would happen, I deleted all the pages after the first, removed the image, then re-threaded the text, to no avail—the text frames were wrapped again. Setting the text frame options to Ignore Text Wrap made no difference. 

I can go to each text frame (in a 400-page book!!) and manually remove the wrap, but I would rather figure this out.

Any ideas??

Thanks,

Susan