A set of text fields that will not delete in the layout, crashes when trying in Prepare Forms panel

I have a document that has produced a set of corrupt fields, I assume. They are all connected with the same field name of "H" and will not delete when I select them. They don't appear on the layout in Prepare Form mode, but if I draw a marquee with the cursor, I see the anchor points of a ghost outline. I can try to delete the item, but it's still there, as if there is a ghost of a former field on the page.

There are five sets of these in the document on five different pages. If I go to Prepare Forms > Fields, I can choose alphabetical order and find the "H" field listed. If I click on that... CRASH, there goes Acrobat.

I can drag these "ghost" fields to the bottom corner of the layout and change their size to small so they are not in the main layout, and so they stay. But I don't want them in document. I'm skeptical I can just "leave them". Any ideas what I can do?